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 67.38%. Comparing base (51db747) to head (110d2fc).
⚠️ Report is 2 commits behind head on main.

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   67.41%   67.38%   -0.03%     
==========================================
  Files         457      458       +1     
  Lines      127606   127684      +78     
  Branches    20872    20874       +2     
==========================================
+ Hits        86023    86043      +20     
- Misses      28981    29036      +55     
- Partials    12602    12605       +3     

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