fix: add signer sponsorship to useMultiFarcasterIdentity

[agustif]

Change Summary

Ads missing sponsorship object on useMultiFarcasterIdentity function.

• [x] Ability to sponsor fees on creation of new signer.

Merge Checklist

• [x] Add changeset with patch bump for framesjs/render

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[agustif]

@agustif please confirm that this works in the debugger

Just tested again, yes sponsoring works with the same changes in my node_modules