Enhance rate limiting by adding a skipper function for health checks

[ziflex]

This pull request introduces improvements to the server's rate limiting functionality, making it more flexible and allowing certain routes to be excluded from rate limiting. It also introduces a constant for the health check route path and ensures the health check endpoint is not rate limited.

Rate limiting enhancements:

• Added a RequestLimitSkipper option to the server, allowing custom logic to skip rate limiting for specific requests. The main application now uses this to exempt the health check endpoint from rate limiting. [1] [2]
• Refactored the rate limiter configuration to use a more flexible calculation for rate and burst, and to support the new skipper function.

Health check endpoint improvements:

• Introduced a HealthPath constant in internal/controllers/health.go and updated the route registration to use this constant, ensuring consistency and easier maintenance.
• Updated the main application to use the new HealthPath constant when configuring the rate limit skipper.

Dependency update:

• Added the echo/v4 package import to main.go to support the new skipper logic.

[Copilot]

Pull request overview

This PR enhances the server's rate limiting functionality by adding a skipper function to exclude specific routes (health checks) from rate limiting, and introduces a constant for the health check endpoint path for better maintainability.

Changes:

• Added RequestLimitSkipper option to allow custom logic for skipping rate limiting on specific requests
• Introduced HealthPath constant in the health controller for consistent route path management
• Refactored rate limiter configuration to support the new skipper function and modify rate calculation logic

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
main.go	Adds echo/v4 import and configures rate limit skipper to exempt health check endpoint
internal/server/server.go	Adds RequestLimitSkipper option, refactors rate limiter configuration with new rate calculation, burst parameter, and modified ExpiresIn duration
internal/controllers/health.go	Introduces HealthPath constant and updates route registration to use it

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