Consider giving snaps access to address book

A deeper integration with MetaMask could be considered by giving snaps the ability to interface with the MetaMask address book, such as adding notes.

The issue names no files, tests, or entry points. Start by clarifying which address-book operations snaps should support, including the example of adding notes, and what permissions or integration boundaries apply. Done should be defined by an agreed scope and acceptance criteria before implementation begins.

Written by the indexing model from the issue text.