fix(snaps-registry): Define missing getState action, stateChange event

[MajorLift]

Explanation

Fixes the SnapsRegistryMessenger type and the JsonSnapsRegistry class. Currently they do not fulfill their intended specifications correctly.

• Define the *:getState action using the ControllerGetStateAction utility type
• Define the *:stateChange event using the ControllerStateChangeEvent utility type
• Define and export a type union for internal action types
• Define and export a type union for internal event types
• Define and export a type for the controller's messenger

This also resolves downstream errors in mobile caused by composable-controller expecting all of its child controllers to have a stateChange event.

• See MetaMask/metamask-mobile@4ea1202

References

• Fixes Fix controllers with missing or incorrect messenger-related types core#4579
• Blocks fix: Apply major ComposableController API updates that fix broken functionality metamask-mobile#10441

Changelog

@metamask/snaps-controllers

Added

• Define and export new types: SnapsRegistryGetStateAction, SnapsRegistryStateChangeEvent (#2655)

Changed

• SnapsRegistryActions is widened to include the SnapsRegistry:getState action (#2655)
• SnapsRegistryEvents is widened to include the SnapsRegistry:stateChange event (#2655)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.27%. Comparing base (4c532f7) to head (1a2a24c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2655   +/-   ##
=======================================
  Coverage   94.27%   94.27%           
=======================================
  Files         478      478           
  Lines        9999     9999           
  Branches     1499     1499           
=======================================
  Hits         9427     9427           
  Misses        572      572           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.