feat!: Add onAssetsMarketData handler

[GuillaumeRx]

BREAKING

This PR adds a new handler called onAssetsMarketData and moves the marketData field of onAssetsConversion to it.

Fixes: #3474

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.23%. Comparing base (38b152a) to head (950671f).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3496      +/-   ##
==========================================
+ Coverage   98.21%   98.23%   +0.01%     
==========================================
  Files         404      406       +2     
  Lines       11336    11441     +105     
  Branches     1766     1783      +17     
==========================================
+ Hits        11134    11239     +105     
  Misses        202      202              

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[FrederikBolding]

LGTM, but lets hold off until we are ready for the breaking change elsewhere