Add property and hook for specifying custom cryptography functions

[Mrtenz]

key-tree now allows specifying custom functions to use for cryptography. To support this in Snaps, I've added a new hook getClientCryptography to the SnapController and entropy-related JSON-RPC methods. This hook should return an object containing the functions to use (or just an empty object to use the defaults).

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@metamask/key-tree@10.0.1	Transitive: environment	+5	4.43 MB	metamaskbot

🚮 Removed packages: npm/@metamask/key-tree@9.1.2

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.48%. Comparing base (cbe55de) to head (fe868ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2909   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files         487      487           
  Lines       10427    10429    +2     
  Branches     1598     1598           
=======================================
+ Hits         9852     9854    +2     
  Misses        575      575           

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