feat(op2): fake async, fix raw fields for WebIDL converter, add more implementations for ToV8 and FromV8

[crowlKats]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 46.03175% with 68 lines in your changes missing coverage. Please review.

Project coverage is 81.46%. Comparing base (0c7f83e) to head (69792fe).
Report is 249 commits behind head on main.

Files with missing lines	Patch %	Lines
core/convert.rs	0.00%	56 Missing ⚠️
ops/op2/mod.rs	53.84%	6 Missing ⚠️
testing/checkin/runner/ops_async.rs	25.00%	3 Missing ⚠️
ops/op2/dispatch_async.rs	71.42%	2 Missing ⚠️
ops/op2/signature.rs	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1065      +/-   ##
==========================================
+ Coverage   81.43%   81.46%   +0.02%     
==========================================
  Files          97      101       +4     
  Lines       23877    27951    +4074     
==========================================
+ Hits        19445    22769    +3324     
- Misses       4432     5182     +750     

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[littledivy]

LGTM