(WIP) Feature/lit 3479 relayerthirdweb proxy requests to thirdweb engine

[Ansonhkg]

Setup scripts & testing

• for ease of testing, the scripts/tests run using bun
  • I call it script because test like create 500 wallets I only need to run it once to setup 500 wallets.
  • maintainBalances can be called when balances in all wallets drop to certain level.
  • ThirdWeb lib abstraction can be found here in lib/thirdweb/ThirdWebLib.ts, under the hood, it's called ThirdWeb apis, but we are only abstracting the ones we need.

API Endpoint for mintAndAddNewAuthMethod
New API endpoint is created for mintAndAddNewAuthMethod, prefix with /api/v2, the mintPkpV2 function has a helper to determine the version from the request url, then based on versionStrategy, it would either use the relayer or ThirdWeb to process transactions.

Environment Variables for this PR

MASTER_WALLET_ADDRESS=
THIRDWEB_ENGINE_URL
THIRDWEB_ACCESS_TOKEN

For other environment variables, refer to the README