Add Payloads and Simple Data Type to Reference Metadata and Report

[darnjo]

Currently, the Payloads and Simple Data Type information from the Data Dictionary is not being serialized into the metadata-report.json files that are produced that turn into the metadata caches we use in reso-certification-etl, which are also used in the services.reso.org/metadata endpoints.

In order for these items to be serialized to the metadata-report.json they also need to be added to the reference OData XML Metadata as annotations and then written to the metadata report. Payloads will be written as a string that's a comma-separated list and parsed into an array, Simple Data Type will be a string.

For now, we will continue to use annotations to do this, but in the future we'll want to consider storing this information in a way that's more consistent with our metadata resources. See RCP-042.

[darnjo]

cc: @mohit-s96