feat(cacheable): add AsOwned

[jerrykingxyz]

Summary

This PR will add AsOwned implementation for rspack_cacheable.

Checklist

• [x] Tests updated (or not required).
• [ ] Documentation updated (or not required).

[netlify[bot]]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	cb1788dd9850a37a2f693c9e6a9b393ba7a59974
🔍 Latest deploy log	https://app.netlify.com/sites/rspack/deploys/673ede1f7e78e5000814c984

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #8500 will not alter performance

_{Comparing jerry/cacheable (cb1788d) with main (c81b139)}

Summary

✅ 1 untouched benchmarks