Add `JsNativeObject` wrapper

[johnyob]

This PR adds a JsNativeObject wrapper around JsObject with the invariant that the underlying object data is a native object of some type T.

[codecov[bot]]

Codecov Report

Attention: 40 lines in your changes are missing coverage. Please review.

Comparison is base (07e2356) 44.59% compared to head (5e459a5) 44.55%. Report is 50 commits behind head on main.

Files	Patch %	Lines
boa_engine/src/object/builtins/jsnative_object.rs	0.00%	40 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3479      +/-   ##
==========================================
- Coverage   44.59%   44.55%   -0.04%     
==========================================
  Files         487      488       +1     
  Lines       50601    50641      +40     
==========================================
  Hits        22563    22563              
- Misses      28038    28078      +40     

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[johnyob]

Are doc tests not covered by codecov?

[jedel1043]

Are doc tests not covered by codecov?

Nope, and I'm not sure if tarpaulin supports testing docs.

[jedel1043]

@jedel1043, @raskad and @HalidOdat will try to review this.