refactor: update RPC URL handling for various networks

[Dprof-in-tech]

Description

• Replaced hardcoded RPC URLs with dynamic URLs using environment variable for improved flexibility and maintainability.
• Updated the getRpcUrl function to return new API endpoints for Polygon, BNB Smart Chain, Base, Arbitrum One, Celo, Lisk, and Ethereum networks.

This pull request updates the way RPC URLs are generated for different blockchain networks in the getRpcUrl function. Instead of using Thirdweb endpoints and the NEXT_PUBLIC_THIRDWEB_CLIENT_ID, the function now uses Dwellir endpoints and a new environment variable, NEXT_PUBLIC_RPC_URL_KEY, for authentication.

RPC URL provider migration:

• Switched RPC endpoints for all supported networks in getRpcUrl from Thirdweb to Dwellir, and replaced usage of NEXT_PUBLIC_THIRDWEB_CLIENT_ID with NEXT_PUBLIC_RPC_URL_KEY for authentication. (app/utils.ts)

References

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation and tests for new/changed functionality in this PR
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not main

By submitting a PR, I agree to Paycrest's Contributor Code of Conduct and Contribution Guide.

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