Add case converter server

[SergiyKusiy]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your implementation in src/createServer.js fully satisfies all task requirements. The code correctly handles URL parsing with URLSearchParams, implements all required validation cases (missing text, missing toCase, invalid case value), properly invokes the convertToCase function, and returns correctly formatted JSON responses. The error messages match the exact specifications, and all 20 checklist items are addressed. One minor note: requirement #18 mentions the statusText for 400 errors. While Node.js automatically sets "Bad Request" as the default statusText when you set statusCode = 400, you could make this more explicit by also setting res.statusMessage = 'Bad Request' if you want to be completely explicit about it. However, this is a minor consideration since the current implementation will work correctly with the default behavior. Your submission is complete and ready for test suite validation. Great work on implementing all the required functionality!

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