Publisher Worker Queue: Fail Trackable

[AndyTWF]

Implement the equivalent of the following AAT Android Worker:

• FailTrackable

As part of this, we should introduce the notion of "final" trackable states. Setting a "final" state a second time, or trying to update the trackable state (via various calls to updateTrackableState) should not succeed if a "final" state has been entered.

A final state is entered when:

• A trackable is failed (see FailTrackableWorker). At this point the state should be set to FAILED.
• A trackable is in the process of being removed (called before we start to disconnect the ably channel). At this point the state should be set to OFFLINE.

A trackables final state should be removed when:

• The trackable has finished being removed (if the state being final is stored somewhere outside the trackable itself)

The FailTrackableWorker:

• Disconnects the Ably channel
• Sets the final state of Failed (along with ErrorInformation) for the trackable.

This work depends on:

• https://github.com/ably/ably-asset-tracking-swift/issues/554

[sync-by-unito[bot]]

➤ Automation for Jira commented:

The link to the corresponding Jira issue is https://ably.atlassian.net/browse/SDK-3368