Rust: Cycle detection and Boxing needs to check recursively

[BelfordZ]

ATM the 'to box or not to box' is too simplistic. We need to know if there is a cycle at play, and if so, always box. The cycles can exist in subschema branches, and so the simplistic approach isnt working for json-schema meta schema.

There are multiple approaches with varying complexity to implement.

1. Box everything
2. Box all refs to struct or enums. Still requires checking the inside of things instead of just pulling the title from the ref, but only 1 level deep still.
3. Hook into traverse method as its running, passing along the isCycle param. Codegen methods can then handle boxing themselves if they are part of a cycle.
4. while doing initial processing, create a map that holds schema.title -> is a cycle. Use this map later to decide if you should box or not.

[BelfordZ]

note: if the reference is used in a HashMap or Vec, boxing is not required (already boxed)

[BelfordZ]

🎉 This issue has been resolved in version 1.9.0 🎉

The release is available on:

• GitHub release
• 1.9.0
• npm package (@latest dist-tag)

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