[lib/native] introduce useCreateFarcasterChannelTag
Summary: We are going to want both this logic on both web and native. Created this shared hook that factors out all the shared logic for creating a farcaster channel tag
Test Plan: flow + confirmed no regressions with creating a farcaster channel tag on native
Reviewers: inka, kamil
Reviewed By: inka
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D12535