feat: add persistent metadata map to claims

[bennycallanan]

Summary

Adds a per-claim metadata store so third-party plugins can attach persistent key-value data directly to claims.

Changes

• Adds metadata (Map<String, String>) to Claim
• Adds getClaimMetadata() and setClaimMetadata() to HuskClaimsAPI

[WiIIiam278]

Ok, sure. I do see one pitfall with this which is that child claims won’t contain their parents metadata, which could confuse plugin authors.

Could you update the API docs for claims on this before I approve?

[bennycallanan]

Ok, sure. I do see one pitfall with this which is that child claims won’t contain their parents metadata, which could confuse plugin authors.

Could you update the API docs for claims on this before I approve?

For most use cases; I don't think the child claim would need the metadata but if it did it could just use #getParent()?

[WiIIiam278]

Thank you for contributing to HuskClaims!