perf: cache usd rate map from API

[DanielSchiavini]

This pull request introduces a caching mechanism to optimize API calls and refactors existing code to use this new caching system.

• cache API responses for pool data, USD prices and CRV APY, with a cache duration of 5 minutes.
  • Moved functions _getCachedData, _getPoolsFromApi, _getAllPoolsFromApi, and _getUsdPricesFromApi to handle cached data retrieval with backwards compatibility.
  • Replaced the cached _getPoolsFromApi function with uncached_getPoolsFromApi and added new functions uncached_getAllPoolsFromApi
  • moved uncached_getUsdPricesFromApi and uncached_getCrvApyFromApi to external-api
• Updated various files to import functions from cached.js instead of external-api.js:
• Added error handling so pools throw a better error if the pool ID is not found, listing available pools.

[Copilot]

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.