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Introducing changes subscription management.

Authored by daniel.

Description

Introducing changes subscription management.

This introduces a service for tracking which clients (subscribers)
are interested in changes to which entities.

Note that the new subscription service is already hooked up via
UsageUpdater, which was using a dummy before.

Bug: T86184
Bug: T86185
Change-Id: I1b3531fd0cb7b840161599c683633069ff71a3f3

Details