Make field's 'microdata' flag available through property API and rely on that

Problem/Motivation

Fields like Date have a more complicated field property definition. In the case of Date, the field switches data structure based on whether or not it can have a to date (from a flat date to a struct). To properly reflect this in the mapping UI, we need to place the microdata flag dynamically in date_entity_metadata_property_info_alter, based on the field settings.

Since not all of the hook_field_info attributes get replicated into the Entity Property API, there are two places we need to check for the microdata flag.

Proposed resolution

Make sure that the microdata flag is replicated from field_info to the field's property settings. Refactor code to check flag using property API rather than field_info array.

API changes

None.