Add jsg::Lenient based on Rust jsg::Nullable

[LordGoatius]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.29%. Comparing base (b6424d1) to head (f83d655).

Files with missing lines	Patch %	Lines
src/rust/jsg/lenient.rs	0.00%	34 Missing ⚠️
src/rust/jsg/wrappable.rs	0.00%	31 Missing ⚠️
src/rust/jsg/resource.rs	0.00%	2 Missing ⚠️
src/rust/jsg/v8.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7037      +/-   ##
==========================================
- Coverage   67.33%   67.29%   -0.04%     
==========================================
  Files         456      457       +1     
  Lines      126797   126858      +61     
  Branches    20713    20713              
==========================================
- Hits        85377    85375       -2     
- Misses      28952    29015      +63     
  Partials    12468    12468              

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