Some optimizations on Error

[CrazyboyQCD]

This brings some optimizations:

• use constant to reduce binary size(https://godbolt.org/z/YEq4hW49n)
• change message's type to Cow<'static, str> to reduce allocations

[codecov]

Codecov Report

Attention: Patch coverage is 48.57143% with 18 lines in your changes missing coverage. Please review.

Project coverage is 52.85%. Comparing base (6ddc2b4) to head (23c6c1a).
Report is 282 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/error.rs	54.83%	14 Missing ⚠️
core/engine/src/builtins/temporal/error.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4020      +/-   ##
==========================================
+ Coverage   47.24%   52.85%   +5.60%     
==========================================
  Files         476      482       +6     
  Lines       46892    46723     -169     
==========================================
+ Hits        22154    24695    +2541     
+ Misses      24738    22028    -2710     

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[jedel1043]

Nice improvement!

[jedel1043]

Looking good! Just needs a small fix.

[jasonwilliams]

Aside from @jedel1043's comment LGTM

[jedel1043]

@jasonwilliams you pinged a random user 😅

[jedel1043]

Looks perfect!