Simplify all extensions APIs of Context

[jedel1043]

It seems like all our extensions usages fall in the same types:

• Rc for JobQueue and ModuleLoader.
• &'static for HostHooks.

This makes our API unnecessarily complex, so we should probably just commit to those representations to simplify our API for the common use case. This also removes the lifetime parameter Context has, which is why there are so many changes. The important changes are:

• https://github.com/boa-dev/boa/pull/3456/files#diff-a665b3b6f564521875fd0d725bffbc4f0cc84e5feefdc5fd875fd943e56311cd (boa_engine/src/context/mod.rs)
• https://github.com/boa-dev/boa/pull/3456/files#diff-febf8b33d5e09ed83ee1d3e23ce44ec020e86033d256526875ec07183b93d7c0 (boa_engine/src/context/maybe_shared.rs [deleted])
• https://github.com/boa-dev/boa/pull/3456/files#diff-872037c107c01bf644ede412e4802b3eefeb5a70ce595c441f75651d45111b2a (boa_engine/src/context/icu.rs)

[codecov]

Codecov Report

Attention: 720 lines in your changes are missing coverage. Please review.

Comparison is base (2a26c29) 44.67% compared to head (3f3613d) 44.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3456      +/-   ##
==========================================
- Coverage   44.67%   44.65%   -0.02%     
==========================================
  Files         488      487       -1     
  Lines       50513    50503      -10     
==========================================
- Hits        22567    22554      -13     
- Misses      27946    27949       +3     

Files	Coverage Δ
boa_engine/src/builtins/array/array_iterator.rs	81.13% <100.00%> (ø)
boa_engine/src/builtins/async_function/mod.rs	39.13% <ø> (ø)
...ngine/src/builtins/async_generator_function/mod.rs	46.15% <ø> (ø)
boa_engine/src/builtins/dataview/mod.rs	16.91% <ø> (ø)
boa_engine/src/builtins/date/mod.rs	92.46% <100.00%> (ø)
boa_engine/src/builtins/error/aggregate.rs	22.22% <ø> (ø)
boa_engine/src/builtins/error/eval.rs	72.72% <ø> (ø)
boa_engine/src/builtins/error/mod.rs	89.58% <ø> (ø)
boa_engine/src/builtins/error/range.rs	72.72% <ø> (ø)
boa_engine/src/builtins/error/reference.rs	73.52% <ø> (ø)
... and 235 more

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[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	95,609	95,609	0
Passed	76,518	76,518	0
Ignored	18,132	18,132	0
Failed	959	959	0
Panics	0	0	0
Conformance	80.03%	80.03%	0.00%

[nekevss]

Looks good to me :)

[HalidOdat]

Looks good! Just a nitpick :)