Context
After the implementation of WT_KEY_PROVIDER extension interface module, we can create a mock module to test all new code within this project. The mock module should have the capability to:

• Periodically perform simple key rotations from time-to-time
• When get_key is called, waits for on_key_update() determining it is persisted.
• When a key blob is persisted, all calls to load_key and get_key (with correct indication of changes) will be using new key blob

The mock module should mimic in a simple way on how they would be utilising key provider system.
E.g.

• versioning: a version number and compatibility information with other versions, allowing the format to change in the future.
• identification: e.g. if something akin to salvage were to see this block, it should be able to distinguish it from the WT page formats used for full pages and deltas.
• UUID: an ID that identifies the active KEK
• blob of data: The KEK key

Definition of Done

• Basic simple rotation and mock module has been created