IsDisplayName and IsDisplayDescription in FieldSummaryModel

How: Add the IsDisplayName and IsDisplayDescription to the FieldSummary model

Why: So we can easily identify fields on an entity that are used as display name and display description, without having to get all field types for the given entity type, traverse those to find the FieldTypeId and THEN get the field from EntityDataModel.Fields using the FieldTypeId, forcing us to do a lot of unnecessary REST requests and loops.

For Who: Developers to optimize code.

Impact: Potentially big.

Additional context:

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