NIFI-8647: Updated VersionedPropertyDescriptor to include information…

[markap14]

… about which properties are referencing resources, how many resource, and the types of resources; updated NiFiRegistryFlowMapper to perform the mapping.

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Enables X functionality; fixes bug NIFI-YYYY.

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[bbende]

Looks good, verified the resource definition is getting populated in versioned flows saved to registry, will merge