Some string optimizations

[CrazyboyQCD]

• Closes Perf: replace js_str! with js_string! where argument is to be converted to JsString to reduce heap allocation #4024
• Some apis changes:
  • get_number_option: property: JsStr<'_> -> JsString
  • get_option: property: JsStr<'_> -> JsString
  • get_temporal_unit: key: JsStr<'_> -> JsString
  • get_typed_fn: name: JsStr<'_> -> JsString
• Use literal in boolean's to_string
• Remove unnecessary to_string in Number::to_js_string
• Use more efficient LazyLock on RAW_STATICS_CACHE since it is immutable

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 318 lines in your changes missing coverage. Please review.

Project coverage is 52.89%. Comparing base (6ddc2b4) to head (1bfe1ef).
Report is 287 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/builtins/regexp/mod.rs	49.01%	26 Missing ⚠️
...ore/engine/src/builtins/temporal/plain_time/mod.rs	0.00%	23 Missing ⚠️
...ore/engine/src/builtins/temporal/plain_date/mod.rs	0.00%	21 Missing ⚠️
core/engine/src/builtins/intl/collator/mod.rs	0.00%	20 Missing ⚠️
core/engine/src/builtins/intl/plural_rules/mod.rs	0.00%	19 Missing ⚠️
core/engine/src/builtins/intl/date_time_format.rs	0.00%	18 Missing ⚠️
.../engine/src/builtins/intl/number_format/options.rs	0.00%	15 Missing ⚠️
core/engine/src/builtins/temporal/duration/mod.rs	0.00%	15 Missing ⚠️
core/engine/src/builtins/intl/list_format/mod.rs	0.00%	13 Missing ⚠️
core/engine/src/builtins/promise/mod.rs	7.69%	12 Missing ⚠️
... and 38 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4030      +/-   ##
==========================================
+ Coverage   47.24%   52.89%   +5.64%     
==========================================
  Files         476      483       +7     
  Lines       46892    46943      +51     
==========================================
+ Hits        22154    24829    +2675     
+ Misses      24738    22114    -2624     

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[hansl]

Two non-blocking nits, but otherwise everything is pretty straightforward.

LGTM.

[hansl]

LGTM

[jedel1043]

Nice work!