Unable to load .graphql files. how to add custom loader for graphq files?#1829

## Bug Report Before I use serverless-esbuild to config loader for .graphql files but with serverless v4 it doesn't work. **Current Behavior** ``` Offline [http for lambda] listening on http://localhost:3002 Function names exposed for local invocation by aws-sdk: * hello: my-service-dev-hello ┌─────────────────────────────────────────────────────────────────────────┐ │ │ │ GET | http://localhost:3000/dev/hello │ │ POST | http://localhost:3000/2015-03-31/functions/hello/invocations │ │ │ └─────────────────────────────────────────────────────────────────────────┘ Server ready: http://localhost:3000 🚀 GET /dev/hello (λ: hello) ✖ Unhandled exception in handler 'hello'. ✖ Runtime.UserCodeSyntaxError: SyntaxError: Unexpected identifier 'mutation_root' at _loadUserApp (/Users/deathemperor/papaya/slsv4-offline/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/aws-lambda-ric/UserFunction.js:239:13) at async module.exports.load (/Users/deathemperor/papaya/slsv4-offline/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/aws-lambda-ric/UserFunction.js:311:19) at async InProcessRunner.run (file:///Users/deathemperor/papaya/slsv4-offline/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/InProcessRunner.js:41:21) at async MessagePort.<anonymous> (file:///Users/deathemperor/papaya/slsv4-offline/node_modules/serverless-offline/src/lambda/handler-runner/worker-thread-runner/workerThreadHelper.js:24:14) ✖ SyntaxError: Unexpected identifier 'mutation_root' ``` **Sample Code** https://github.com/papaya-insurtech/slsv4-offline **Expected behavior/code** <!-- A clear and concise description of what you expected to happen (or code). --> **Environment** - `serverless` version: 4.4.7 - `serverless-offline` version: 14.3.3 - `node.js` version: v22.9.0 - `OS`: macOS 15.1 **Possible Solution** N/A