feat: Add snap_getInterfaceContext

[FrederikBolding]

Expose a new RPC method snap_getInterfaceContext that makes the context easily accessible outside onUserInput. Also adds the necessary wiring to make this RPC method work in the simulation environment.

This feature will require the addition of a getInterfaceContext method hook in the clients.

Progresses #2901

[codecov]

Codecov Report

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

Project coverage is 94.48%. Comparing base (126990b) to head (399e937).
Report is 1 commits behind head on main.

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2902   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files         486      487    +1     
  Lines       10405    10427   +22     
  Branches     1597     1598    +1     
=======================================
+ Hits         9831     9852   +21     
- Misses        574      575    +1     

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