Add more utility traits and funtions to boa_interop

[hansl]

This PR adds support for Fn(...) closures, assuming the closure is Copy. This should satisfy the unsafe requirement established in #3772 for that kind of function.

This also add implementations for both IntoJsFunction and IntoJsFunctionUnsafe for up to 12 arguments, including a JsRest argument, a JsThis argument and a Context argument, all of whom can be placed at the end of the list of required arguments.

This also adds support for return value from the functions, both JsValue-convertible types as well as JsResult<...>, as long as the inner value is convertible to a JsValue.

[codecov]

Codecov Report

Attention: Patch coverage is 29.54545% with 62 lines in your changes are missing coverage. Please review.

Project coverage is 50.30%. Comparing base (6ddc2b4) to head (deda29b).
Report is 126 commits behind head on main.

Files	Patch %	Lines
core/interop/src/lib.rs	23.07%	30 Missing ⚠️
core/interop/src/into_js_function_impls.rs	31.70%	28 Missing ⚠️
core/engine/src/try_into_js_result_impls.rs	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3773      +/-   ##
==========================================
+ Coverage   47.24%   50.30%   +3.05%     
==========================================
  Files         476      458      -18     
  Lines       46892    44905    -1987     
==========================================
+ Hits        22154    22589     +435     
+ Misses      24738    22316    -2422     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jedel1043]

Just have two small suggestions. Everything else looks great!

[jedel1043]

Really nice API! I'm preemptively approving considering that we'll work on this incrementally, but left some additional comments for discussion.

[nekevss]

This is looking great! I had one small question.

[nekevss]

LGTM :)