fix: Increase Snap interface context size limit slightly

[FrederikBolding]

Increase MAX_CONTEXT_SIZE to 5 MB, letting Snap developers store somewhat large objects in the interface context. This is useful for caching images for rendering for instance.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.98%. Comparing base (1382f6b) to head (c71f56e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3246   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files         510      510           
  Lines       11303    11303           
  Branches     1750     1750           
=======================================
  Hits        10736    10736           
  Misses        567      567           

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