[Request] Add connected address to FrameData

[larrythecucumber321]

Issue

The connected address property within FrameData offers limited functionality.

In some specific instances (for Transaction requests' target), the address property of FrameData is populated (see #138)

Feature Request

For any verified frames, a user's fid will be present, through which we can grab the connected address. There are ways Frog would have to be opinionated on this, such as exposing the first verified_address, or the custody_address as a fallback (see https://docs.neynar.com/reference/user-bulk).

In the alternative, it would be good to expose helper functions for fetching users' addresses, as FramesJS
https://framesjs.org/reference/js/getAddressForFid

[larrythecucumber321]

Nevermind, this is exposed here https://frog.fm/concepts/middleware#neynar