Add utility methods to the Class trait

[jedel1043]

Adds some requested utilities for our Class trait.

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (5274b91) 44.59% compared to head (b2c848a) 44.57%.

Files	Patch %	Lines
boa_engine/src/class.rs	0.00%	27 Missing ⚠️
boa_engine/src/object/mod.rs	20.00%	4 Missing ⚠️
boa_examples/src/bin/classes.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3488      +/-   ##
==========================================
- Coverage   44.59%   44.57%   -0.02%     
==========================================
  Files         487      487              
  Lines       50601    50621      +20     
==========================================
  Hits        22563    22563              
- Misses      28038    28058      +20     

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[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	95,609	95,609	0
Passed	76,526	76,526	0
Ignored	18,132	18,132	0
Failed	951	951	0
Panics	0	0	0
Conformance	80.04%	80.04%	0.00%

[HalidOdat]

Looks good to me! :)