[SDKv2] Add Account support for secp256k1 scheme#1
### Description Prev stack - https://github.com/aptos-labs/aptos-core/pull/10321 This PR updates the `Account` class to be compatible with `secp256k1` scheme. 1. Split the AuthenticationKey scheme into `SigningScheme` and `DeriveScheme` 2. Add Account support for `secp256k1` scheme 3. Update unit test ### Test Plan <!-- Please provide us with clear details for verifying that your changes work. --> pnpm fmt pnpm test
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