WL#4352: Data Dictionary: a prototype

Affects: Server-Prototype Only   —   Status: Assigned   —   Priority: Medium

Produce a prototype implementation of the new data dictionary with data stored
in relational tables.

What is currently stored in the data dictionary might not be enough. Some
examples include:

• the current AUTO_INCREMENT value
• create_time, update_time (Bug#11745384 14374: UPDATE_TIME IS NULL FOR INNODB
• FOREIGN KEY constraints (well, this can be deemed out of scope of the prototype)