Exploration DML

This spec describes features necessary for the user to INSERT, UPDATE, and DELETE records from within the Data Explorer.

The work is further broken out into more specific specs documents to handle specific scenarios. The work is to be completed in the following order:

1. Updating base table cells (TODO)
2. Updating “many-to-one” cells (TODO)
3. Updating “one-to-many” cells (TODO)
4. Updating “many-to-many” cells (TODO)
5. Inserting and deleting base table records (TODO)