feat: add Object::GetPrototype and Object::SetPrototype

[KevinEady]

• Add Object::GetPrototype and Object::SetPrototype
• Update docs and tests

Fixes: #1691

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.51%. Comparing base (fe0c48e) to head (aa0f8c0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
napi-inl.h	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1715   +/-   ##
=======================================
  Coverage   63.50%   63.51%           
=======================================
  Files           3        3           
  Lines        2047     2050    +3     
  Branches      728      729    +1     
=======================================
+ Hits         1300     1302    +2     
  Misses        162      162           
- Partials      585      586    +1     

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