Add withPayload to JWTCreator.Builder

[jimmyjames]

Changes

This change adds a withPayload(Map<String, ?> payloadClaims) to the JWTCreator.Builder. It uses #454 as a starting point.

Details:

• It only supports claim values of supported types
• The behavior for map or list claims is consistent with the implementation of withClaim(String name, Map<String, ?> map) and withClaim(String name, List<?> list)
• If any of the claim values are invalid, none will be added to the payload claims

This will resolve #445

References

• Suggestion to create method withPayload in JWTCreator.java #445 and Feature/#445 - withPayload(Map<String, Object> payloadClaims) method #454

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors