Add MVP of virtual machine tracer

[nekevss]

This pull request implements a new VirtualMachineTracer trait that emits VirtualMachineEvents rather than immediately printing the values to stdout.

This should allow better customization of event handling.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,687	49,666	-21
Ignored	2,262	2,284	+22
Failed	1,014	1,013	-1
Panics	0	0	0
Conformance	93.81%	93.77%	-0.04%

Tested main commit: b3d820369072123ded8defc927405b99b9012648
Tested PR commit: 01e41cd03fa72e78cc7a00ec3bcf4e67e5ca357d
Compare commits: b3d8203...01e41cd

[codecov]

Codecov Report

❌ Patch coverage is 39.65517% with 350 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.81%. Comparing base (6ddc2b4) to head (fd0451c).
⚠️ Report is 1052 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/vm/operands.rs	39.26%	348 Missing ⚠️
core/engine/src/vm/mod.rs	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4931       +/-   ##
===========================================
+ Coverage   47.24%   62.81%   +15.56%     
===========================================
  Files         476      537       +61     
  Lines       46892    60433    +13541     
===========================================
+ Hits        22154    37958    +15804     
+ Misses      24738    22475     -2263     

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[jedel1043]

It might be better to granularize this, because some tracers would need to have the individual operands and stack values instead of a big string; I'm thinking of like a web-based tracer that displays the stack in a more dynamic way, for example.

[nekevss]

Ah, sorry just saw this!

Thats a good idea. I'll make the update ASAP

[jedel1043]

Any updates on this?

[nekevss]

Still planning to eventually take another pass at this when I have a bit of time.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	53,578	53,578	0
Passed	51,432	51,432	0
Ignored	1,648	1,648	0
Failed	498	498	0
Panics	0	0	0
Conformance	95.99%	95.99%	0.00%

Tested main commit: 257bc301afa0cda88f470a8452251ade54d516e3
Tested PR commit: fd0451c1c26945de73590a5cceac01cf5d7c4d06
Compare commits: 257bc30...fd0451c