Fix coingecko wrapper

[rudrasheth]

Of course. Here is a professional description you can copy and paste for your new pull request.

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## Title

fix: Replace incomplete CoinGecko wrapper with complete version

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## Description

This pull request resolves an issue from a previous PR where an incomplete version of the CoinGecko wrapper was merged. This new, complete script replaces the old one entirely.

The updated coingecko.py is a comprehensive, production-ready wrapper that integrates all 75+ public endpoints from the CoinGecko API, providing full access to their cryptocurrency, NFT, and market data.

## Key Changes

• Complete Endpoint Coverage: Implements all major API endpoints, including detailed coin data, market charts, exchanges, derivatives, and NFT information.
• Robust CLI: Features a full command-line interface that maps one-to-one with the wrapped functions, allowing for easy testing and integration.
• Replaces Incomplete Code: This PR deletes the old, partial script and replaces it with this final, fully functional version.

## API Information

• Provider: CoinGecko
• Free Tier: Yes, the public API is free to use.
• Documentation: https://www.coingecko.com/en/api/documentation

## Testing

The script and its CLI commands have been manually tested, including:

• Core commands (price, details, history).
• Newly added commands (nft-list, treasury, derivatives).
• Error handling for invalid commands and missing arguments.