Add an interaction api

[mwestphal]

Add an API to let libf3d users control how interactions are handled

• Add interactor::addInteractionCommand, interactor::removeInteractorCommand
• Use it in interactor_impl to declare all libf3d interactions
• Use it in F3DStarter to to declare all F3D interactions
• Remove interactor::setKeyPressCallBack
• Implement the interaction command logic in OnKeyPress
• Update TestSDKInteractorCallback accordingly
• Add libf3d doc
• Add python bindings and tests

To do later:

• Add defaults API: Another PR
• Add config file control: Another PR
• Add complete interaction doc: Another PR
• DropFile interaction and command: Add interaction command for dropping files #1701

[github-actions]

You are modifying libf3d public API! ⚠️Please update bindings accordingly⚠️!
You can find them in their respective directories: python, java, webassembly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.96%. Comparing base (15d0b19) to head (86942db).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1687      +/-   ##
==========================================
- Coverage   96.98%   96.96%   -0.02%     
==========================================
  Files         106      106              
  Lines        8781     8733      -48     
==========================================
- Hits         8516     8468      -48     
  Misses        265      265              

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