fix(alchemy-signer): missing transports on iOS during passkey creation

[moldy530]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

The focus of this PR is to handle cases where attestation.transports is empty or null on iOS by assigning default values.

Detailed summary

• Handle cases where attestation.transports is empty or null on iOS
• Assign default values to attestation.transports if necessary

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[denniswon]

import { TurnkeyClient, getWebAuthnAttestation } from "@turnkey/http";

this is returning the attestation. is this their SDK issue for not handling ios?

[moldy530]

yea this is something they should handle imo, but I wanna unblock dubz

[denniswon]

@moldy530