[Bug]: Verify UR 2.1 on etherscan

[gretzke]

Describe the bug

Unable to verify UR 2.1 on etherscan due to restrictions with free api key on the following chains:

• 10: Optimism
• 56: BSC
• 43114: Avalanche
• 8453: Base

Also register v4 for Avalanche (43114):
v4PoolManagerAddress: '0x06380c0e0912312b5150364b9dc4542ba0dbbc85',
v4PositionManagerAddress: '0xb74b1f14d2754acfcbbe1a221023a5cf50ab8acd',
v4StateView: '0xc3c9e198c735a4b97e3e683f391ccbdd60b69286',
v4QuoterAddress: '0xbe40675bb704506a3c2ccfb762dcfd1e979845c2',

Expected Behavior

To Reproduce

No response

Additional context

No response