Add a JsError::from_rust constructor to create native errors from Rust

[hansl]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 51.56%. Comparing base (6ddc2b4) to head (7243dd3).
Report is 222 commits behind head on main.

Files	Patch %	Lines
core/engine/src/error.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3921      +/-   ##
==========================================
+ Coverage   47.24%   51.56%   +4.32%     
==========================================
  Files         476      468       -8     
  Lines       46892    44965    -1927     
==========================================
+ Hits        22154    23188    +1034     
+ Misses      24738    21777    -2961     

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[raskad]

I like the addition. What do you think about the name from_rust instead of from_std? I think Error is moving to core so eventually we could switch that type over without changing the name.

[hansl]

@raskad I made the change, PTAL.