Add a way to add setters/getters in js_class!

[hansl]

And update documentation for more explanation around the macro.

[hansl]

Converting to draft as I've come up with a better interface for getter/setter. Basically:

prop name_of_prop as "nameOfProp" {
  fn getter(...) {}
  fn setter(...) {}
}

with getter and setter optional. That way we don't need 3 sections for properties and it's a bit simpler.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 51.59%. Comparing base (6ddc2b4) to head (2a4aa1b).
Report is 211 commits behind head on main.

Files	Patch %	Lines
core/interop/src/macros.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3911      +/-   ##
==========================================
+ Coverage   47.24%   51.59%   +4.35%     
==========================================
  Files         476      468       -8     
  Lines       46892    44839    -2053     
==========================================
+ Hits        22154    23136     +982     
+ Misses      24738    21703    -3035     

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[hansl]

Okay this does use the new API now.

[jedel1043]

Good work! Looks perfect to me.

[jedel1043]

Thought: the syntax is getting a bit too DSL-like, so I'll probably see if I can start working on that proc macro.