feat(graalvm): add structuredClone support

[sgammon]

Summary

Adds a very simple structured clone via guest-side JSON.parse(JSON.stringify(x)).

• JS API: structuredClone support #1267

Changelog

feat(graalvm): add `structuredClone` support
test(graalvm): add `structuredClone` tests

[codecov]

Codecov Report

Attention: Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.

Project coverage is 48.42%. Comparing base (fcf5cdf) to head (992250c).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...elide/runtime/javascript/StructuredCloneBuiltin.kt	64.28%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1280      +/-   ##
==========================================
+ Coverage   48.40%   48.42%   +0.01%     
==========================================
  Files         500      501       +1     
  Lines       18365    18379      +14     
  Branches     3265     3269       +4     
==========================================
+ Hits         8890     8900      +10     
- Misses       8462     8464       +2     
- Partials     1013     1015       +2     

Flag	Coverage Δ
jvm	48.42% <64.28%> (+0.01%)	⬆️
lib	48.42% <64.28%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...elide/runtime/javascript/StructuredCloneBuiltin.kt	64.28% <64.28%> (ø)

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fcf5cdf...992250c. Read the comment docs.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.