[Cashtab] Claim NFToa Protocol ID

Summary:
Updates the protocol identifier table by formalizing the spec details for the new NFToa Protocol ID. This revision ensures the on-chain data is correctly mapped to the protocol's official display name and authors.

A complete and detailed specification for the NFToa protocol, including all technical requirements and usage guidelines, has been added to 'nftoa.md'.

Depends on D18757.

Test Plan: Verified that the new row in the protocol identifier table correctly reflects the intended on-chain data representation. Documentation in 'nftoa.md' reviewed for completeness and accuracy.

Reviewers: bytesofman, O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Subscribers: Fabien, nftoa, bytesofman

Tags: #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D18656