Add C bindings + example

[noclone]

Describe your changes

Supersede https://github.com/f3d-app/f3d/pull/1892

Add C bindings and a usage example.

Issue ticket number and link if any

https://github.com/f3d-app/f3d/issues/1307

Checklist for finalizing the PR

• [x] I have performed a self-review of my code
• [x] I have added tests for new features and bugfixes
• [x] I have added documentation for new features
• [x] If it is a modifying the libf3d API, I have updated bindings
• [ ] If it is a modifying the .github/workflows/versions.json, I have updated docker_timestamp

Continuous integration

Please write a comment to run CI, eg: \ci fast. See here for more info.

[noclone]

\ci fast

[noclone]

\ci full

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 96.53%. Comparing base (f0781c3) to head (9f06c38). :warning: Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2695   +/-   ##
=======================================
  Coverage   96.53%   96.53%           
=======================================
  Files         141      141           
  Lines       12515    12535   +20     
=======================================
+ Hits        12081    12101   +20     
  Misses        434      434           

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