feat: v2 identity API endpoint accepting CAIP-10

[chris13524]

When we support more than mainnet ENS resolution, knowing which chain the user is on would be useful information to determine which resolver to use.

I propose an endpoint format like /v2/identity/<account-id> where account-id is a CAIP-10 account ID.

For example: /v2/identity/eip155:1:0xabc...

Slack conversation