feat: support marshal

[yfractal]

Added Marshal::dump and Marshal::load.

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 8 of 8 files.

Overall, the semantic diff is 2% smaller than the GitHub diff.

	Filename	Status
✔️	examples/rutie_ruby_example/src/lib.rs	Analyzed
✔️	src/binding/marshal.rs	Analyzed
✔️	src/binding/mod.rs	Analyzed
✔️	src/class/marshal.rs	Analyzed
✔️	src/class/mod.rs	Analyzed
✔️	src/lib.rs	80.17% smaller
✔️	src/rubysys/marshal.rs	Analyzed
✔️	src/rubysys/mod.rs	Analyzed

[yfractal]

ping @danielpclark

[danielpclark]

Thanks for doing this. I'll try and make a point to get to this this weekend.