Add displayOrder, typeClass and isRequired fields to DatasetFieldType payload

[GPortas]

What this PR does / why we need it:

The API endpoint /api/metadatablocks/{block_id} has been extended to include the following fields:

• isRequired - Wether or not this field is required
• displayOrder: The display order of the field in create/edit forms
• typeClass: The type class of this field ("controlledVocabulary", "compound", or "primitive")

Which issue(s) this PR closes:

• Closes Extend 'metadatablocks/{block_id}' endpoint JSON output to include 'isRequired', 'typeClass' and 'displayOrder' fields #10216

Suggestions on how to test this:

curl http://localhost:8080/api/v1/metadatablocks/citation

See how citation fields subJson contains the new 'isRequired' and 'displayOrder' fields.

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

No

Is there a release notes update needed for this change?:

Yes.

[coveralls]

coverage: 20.153%. remained the same
when pulling 0f4a455 on 10216-metadatablocks-payload-extension
into e5e232d on develop.

[sekmiller]

Looks good. I just made a fix to a typo in the release note

[GPortas]

@sekmiller

I have added another required field to the payload so I have moved this PR back to ready for review.

[github-actions]

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