Add server tests

[niteshbalusu11]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @niteshbalusu11, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a comprehensive suite of server-side tests, significantly improving the test coverage for both public and authenticated API endpoints. It includes the necessary dependency additions and minor refactorings to enable robust testing of the server's functionality.

Highlights

• New Test Suite: A dedicated server/src/tests module has been added, containing new unit and integration tests for the server's API endpoints.
• API Endpoint Testing: Extensive tests have been implemented for key gated API endpoints such as user registration, push token management, user information retrieval, and LN address updates. Public API endpoints like getk1 and lnurlp_request are also now covered by tests.
• Dependency Updates: New development dependencies including tower, tracing-test, and hdrhistogram have been added to support the new testing infrastructure.
• API Response Struct Refactoring: Several API response structs across gated_api_v0.rs and public_api_v0.rs have been updated with Deserialize derives and public fields to facilitate easier deserialization and testing of API responses.
• Route Method Change: The /user_info API route has been changed from a GET request to a POST request.

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[gemini-code-assist]

Code Review

This pull request adds a comprehensive set of server tests, which is a great step towards ensuring the application's stability and correctness. The changes to make response structs deserializable and their fields public for testing purposes are reasonable. I've identified a few areas in the new test code where refactoring could reduce duplication and improve maintainability. My comments focus on these opportunities for improvement.