Problem:
For our users to be able to make statements that use EntitySchema values we need an "expert" that accepts EntitySchema IDs.

Example:
The expert should:

• Accept EntitySchema IDs (E10)
• Display the label and description of that EntitySchema

Acceptance criteria:

• An expert is implemented for statements using an EntitySchema Property that accepts EntitySchema IDs and displays the label and description of that EntitySchema

Notes
Ideally, searching for EntitySchemas by label and alias would also be supported, but will be investigated and developed in a separate task.