Switch from Chi to Gin web framework

[AmineAfia]

TL;DR

Migrated the API from Chi to Gin framework and updated related components.

What changed?

• Replaced Chi router with Gin in cmd/api.go
• Updated API handlers to use Gin context
• Modified middleware to work with Gin
• Adjusted api.go to use Gin-compatible error handlers
• Updated Meta struct to use uint64 for ChainId
• Changed GetChainId function to return *big.Int
• Removed api.go file from internal/handlers package

How to test?

1. Run the API server
2. Test all existing endpoints to ensure they work with the new Gin implementation
3. Verify that authentication middleware still functions correctly
4. Check that error handling and responses are consistent with the previous implementation

Why make this change?

The migration to Gin framework offers several benefits:

• Improved performance and efficiency
• Better support for middleware and routing
• Enhanced request handling and parameter parsing
• Simplified error management and response formatting

This change aims to streamline the API implementation and potentially improve overall application performance.

[AmineAfia]

• Integrate swagger docs #81
• Switch from Chi to Gin web framework #79 👈
• main

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