add string representation of Sort::Relevance#65

The current empty string provided by `Sort::Relevance.to_str()` results in inaccurate results. For example: ```sh $ curl -A 'crates-io-api' 'https://crates.io/api/v1/crates?page=1&per_page=3&sort=&q=tokio' | jq % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 2572 100 2572 0 0 14591 0 --:--:-- --:--:-- --:--:-- 14953 { "crates": [ { "badges": [], "categories": null, "created_at": "2016-07-01T20:39:07.497766+00:00", "description": "An event-driven, non-blocking I/O platform for writing asynchronous I/O\nbacked applications.\n", "documentation": null, "downloads": 103432336, "exact_match": true, "homepage": "https://tokio.rs", "id": "tokio", "keywords": null, "links": { "owner_team": "/api/v1/crates/tokio/owner_team", "owner_user": "/api/v1/crates/tokio/owner_user", "owners": "/api/v1/crates/tokio/owners", "reverse_dependencies": "/api/v1/crates/tokio/reverse_dependencies", "version_downloads": "/api/v1/crates/tokio/downloads", "versions": "/api/v1/crates/tokio/versions" }, "max_stable_version": "1.28.2", "max_version": "1.28.2", "name": "tokio", "newest_version": "1.28.2", "recent_downloads": 14214868, "repository": "https://github.com/tokio-rs/tokio", "updated_at": "2023-05-27T21:19:40.446763+00:00", "versions": null }, { "badges": [], "categories": null, "created_at": "2018-06-01T23:51:51.130358+00:00", "description": "A native, asynchronous Apple push notification client", "documentation": "https://docs.rs/a2", "downloads": 32149, "exact_match": false, "homepage": "https://github.com/walletconnect/a2", "id": "a2", "keywords": null, "links": { "owner_team": "/api/v1/crates/a2/owner_team", "owner_user": "/api/v1/crates/a2/owner_user", "owners": "/api/v1/crates/a2/owners", "reverse_dependencies": "/api/v1/crates/a2/reverse_dependencies", "version_downloads": "/api/v1/crates/a2/downloads", "versions": "/api/v1/crates/a2/versions" }, "max_stable_version": "0.7.1", "max_version": "0.7.1", "name": "a2", "newest_version": "0.7.1", "recent_downloads": 5386, "repository": "https://github.com/walletconnect/a2.git", "updated_at": "2023-06-05T19:35:18.195967+00:00", "versions": null }, { "badges": [], "categories": null, "created_at": "2020-10-25T07:00:31.673939+00:00", "description": "Asynchronous, zero-allocation HTTP client that is agnostic to choice of executor", "documentation": null, "downloads": 282, "exact_match": false, "homepage": null, "id": "aahc", "keywords": null, "links": { "owner_team": "/api/v1/crates/aahc/owner_team", "owner_user": "/api/v1/crates/aahc/owner_user", "owners": "/api/v1/crates/aahc/owners", "reverse_dependencies": "/api/v1/crates/aahc/reverse_dependencies", "version_downloads": "/api/v1/crates/aahc/downloads", "versions": "/api/v1/crates/aahc/versions" }, "max_stable_version": "0.1.0", "max_version": "0.1.0", "name": "aahc", "newest_version": "0.1.0", "recent_downloads": 43, "repository": "https://gitlab.com/Hawk777/aahc", "updated_at": "2020-10-25T07:00:31.673939+00:00", "versions": null } ], "meta": { "next_page": "?page=2&per_page=3&sort=&q=tokio", "prev_page": null, "total": 4278 } } $ curl -A 'crates-io-api' 'https://crates.io/api/v1/crates?page=1&per_page=3&sort=relevance&q=tokio' | jq % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 2864 100 2864 0 0 2047 0 0:00:01 0:00:01 --:--:-- 2051 { "crates": [ { "badges": [], "categories": null, "created_at": "2016-07-01T20:39:07.497766+00:00", "description": "An event-driven, non-blocking I/O platform for writing asynchronous I/O\nbacked applications.\n", "documentation": null, "downloads": 103432336, "exact_match": true, "homepage": "https://tokio.rs", "id": "tokio", "keywords": null, "links": { "owner_team": "/api/v1/crates/tokio/owner_team", "owner_user": "/api/v1/crates/tokio/owner_user", "owners": "/api/v1/crates/tokio/owners", "reverse_dependencies": "/api/v1/crates/tokio/reverse_dependencies", "version_downloads": "/api/v1/crates/tokio/downloads", "versions": "/api/v1/crates/tokio/versions" }, "max_stable_version": "1.28.2", "max_version": "1.28.2", "name": "tokio", "newest_version": "1.28.2", "recent_downloads": 14214868, "repository": "https://github.com/tokio-rs/tokio", "updated_at": "2023-05-27T21:19:40.446763+00:00", "versions": null }, { "badges": [], "categories": null, "created_at": "2021-12-16T23:44:58.414893+00:00", "description": "A `tracing-subscriber::Layer` for collecting Tokio console telemetry.\n", "documentation": null, "downloads": 2047568, "exact_match": false, "homepage": "https://github.com/tokio-rs/console/blob/main/console-subscriber", "id": "console-subscriber", "keywords": null, "links": { "owner_team": "/api/v1/crates/console-subscriber/owner_team", "owner_user": "/api/v1/crates/console-subscriber/owner_user", "owners": "/api/v1/crates/console-subscriber/owners", "reverse_dependencies": "/api/v1/crates/console-subscriber/reverse_dependencies", "version_downloads": "/api/v1/crates/console-subscriber/downloads", "versions": "/api/v1/crates/console-subscriber/versions" }, "max_stable_version": "0.1.9", "max_version": "0.1.9", "name": "console-subscriber", "newest_version": "0.1.9", "recent_downloads": 655339, "repository": "https://github.com/tokio-rs/console/", "updated_at": "2023-05-09T22:44:32.148858+00:00", "versions": null }, { "badges": [], "categories": null, "created_at": "2021-02-13T07:18:52.649916+00:00", "description": "PyO3 utilities for Python's Asyncio library", "documentation": "https://docs.rs/crate/pyo3-asyncio/", "downloads": 371492, "exact_match": false, "homepage": "https://github.com/awestlake87/pyo3-asyncio", "id": "pyo3-asyncio", "keywords": null, "links": { "owner_team": "/api/v1/crates/pyo3-asyncio/owner_team", "owner_user": "/api/v1/crates/pyo3-asyncio/owner_user", "owners": "/api/v1/crates/pyo3-asyncio/owners", "reverse_dependencies": "/api/v1/crates/pyo3-asyncio/reverse_dependencies", "version_downloads": "/api/v1/crates/pyo3-asyncio/downloads", "versions": "/api/v1/crates/pyo3-asyncio/versions" }, "max_stable_version": "0.18.0", "max_version": "0.18.0", "name": "pyo3-asyncio", "newest_version": "0.18.0", "recent_downloads": 123790, "repository": "https://github.com/awestlake87/pyo3-asyncio", "updated_at": "2023-02-02T02:14:49.497724+00:00", "versions": null } ], "meta": { "next_page": "?page=2&per_page=3&sort=relevance&q=tokio", "prev_page": null, "total": 4278 } } ``` You can compare these results with searching crates.io using the default ("relevance") sorting: https://crates.io/search?q=tokio