feat: add extension settings to PreferencesController

[fabiobozzo]

Explanation

This PR adds missing preference properties to the core PreferencesController that currently only exist in the MetaMask Extension's custom implementation. This is a prerequisite for the Extension to migrate from its custom PreferencesController to the core package.

The Extension has accumulated many additional preferences over time that were never added to the core controller. This PR brings the core controller to feature parity by adding:

• Visual/UI preferences (theme, locale, blockies, etc.)
• Security/privacy preferences (phishing detection, external services, etc.)
• Advanced settings (gas fees, hardware wallet config, etc.)
• Feature flags (Snaps, watch accounts, etc.)
• User experience preferences (auto-lock, token display, etc.)

No behavioral changes - just expanding the state interface to support all preferences currently used by the Extension.

References

• Related to refactor: move advanced settings to core PreferencesController metamask-extension#34443 which migrates to use this updated controller
• Supports the Wallet Framework initiative by enabling unified controllers

Changelog

@metamask/preferences-controller - BREAKING: Expanded PreferencesState interface with additional properties previously only in Extension

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes