[AC-144] Initial implementation of impression capping in MAC

[jonesetc]

Initial implementation of opt-in impression capping.

Telemetry:

• failure to create connection to backing data store
• failure to perform operations with backing data store (record, count, retain)
• impression cap hit
• impression cap enforced or ignored

There should be no breaking changes as there is only a new option added to FFI functions, but there has been a new optional param added to native rust interface.

Documentation still needs to be updated.

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