Add a method to return a FID by an authorized verification address

[mehcode]

Implements farcasterxyz/protocol#244

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Add GetFidByVerification to Hub which allows a developer to take an authorized address and return a FID.

The use case here is we ( Calaxy - https://calaxy.com ) are integrating with both Base.app and Farcaster. When logging in with Base, an ethereum address is returned ( ref: https://docs.base.org/base-account/overview/what-is-base-account ). When logging in with Farcaster, a FID is returned.

• With an FID, it's possible currently to get a list of authorized ethereum addresses and match a previous "Base.app login" with a new "Farcaster login" to return the same user context

• With just the address, its not currently possible to return an associated FID

This will be especially important as current Base.app applications with "Login with Base.app" end up becoming mini apps and using the embedded Farcaster SDK.

Open to anything with regards to naming. I tried to make it match the feel of what's there.

[vercel]

@mehcode is attempting to deploy a commit to the farcaster Team on Vercel.

A member of the Team first needs to authorize it.

[sanjayprabhu]

Nice. Could you please add store and server level tests?

[christopherwxyz]

I don't think this will work as auth addresses can be tied to multiple FIDs? Per the spec multiple addresses can be verified and added. So maybe this method should return all FIDs for the given address.

[mehcode]

I don't think this will work as auth addresses can be tied to multiple FIDs? Per the spec multiple addresses can be verified and added. So maybe this method should return all FIDs for the given address.

I'm only exposing via API what was already done in the secondary indexes inside of the verification store. If that part needs correcting, I'd love some help in the right direction. Though maybe that should also be a separate PR. I can adjust this one to return a list response so the API is compatible with the fix.

Nice. Could you please add store and server level tests?

Can you please link to an example of each and I'll give it a try?