feat: implement createServer function for case conversion API

[adonch]

• Add HTTP server setup to handle text case conversion requests.
• Validate input parameters and return appropriate error messages.
• Support multiple case formats: SNAKE, KEBAB, CAMEL, PASCAL, UPPER.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution. This is a very strong implementation that correctly handles all the core requirements, from URL parsing and validation to generating the correct JSON responses.

As a minor point of feedback, the task requirements specify that a successful response should have a 200 status and 'OK' status text. While your code res.writeHead(200, { 'Content-Type': 'application/json' }) works perfectly because 'OK' is the default, it's good practice to be explicit. You could write this as res.writeHead(200, 'OK', { 'Content-Type': 'application/json' }) to match the requirement exactly.

This doesn't break functionality, so it's not a required change. Excellent work on this task!

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[mateacademy-ai-mentor]

The task requirements specify that for a successful request, the response should have a 200 status and 'OK' status text. While 'OK' is the default status text for a 200 status code, it's better to be explicit here as requested. You can pass the status text as the second argument to res.writeHead.