feat!: Add snap_getPreferences

[FrederikBolding]

Adds snap_getPreferences, an alternative to snap_getLocale that exposes both the currently selected locale and the currently selected currency for fiat conversion.

Following the release of this, we should deprecate snap_getLocale for eventual removal.

Breaking: As this modifies the method hooks for snap_getLocale to use a shared hook with snap_getPreferences.

Closes #2600

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.18%. Comparing base (87ae21f) to head (547d9b4).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...s/snaps-simulator/src/features/simulation/sagas.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2607   +/-   ##
=======================================
  Coverage   94.17%   94.18%           
=======================================
  Files         476      477    +1     
  Lines        9820     9833   +13     
  Branches     1497     1498    +1     
=======================================
+ Hits         9248     9261   +13     
  Misses        572      572           

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