Implement applyDiff Error Handling

[jleandroperez]

We've received a report of an entity getting stuck, and not receiving changes from other devices.

Luckily, we got access to the internal .sqlite file. The internal ghostData is in sync with the backend, while the contents of the member are not.

• Implement a Unit Test to recreate the scenario in which the entity has local changes, a remote diff gets received, and in the exact meantime new changes are introduced.
• Make sure that SPChangeProcessor.processRemoteModifyWithKey method is not allowing for scenarios in which the local-changes-rebase code doesn't run, afterwards new changes get introduced, and applyDiff fails.
• If applyDiff fails, we should:

1. Request the full entity
2. Calculate Delta: LocalGhost > LocalMembers
3. Load the full Remote Member Data
4. If the delta from step (2) is not empty, then let's attempt to rebase + apply localDiff
4.1. Calculate Delta: LocalGhost > RemoteMembers
4.2. Transform localDiff: LocalGhost >> RemoteMembers >> LocalDiff (equivalent to git rebase)
4.3. Attempt to apply the Local Transformed Diff
5. Update the ghost with the remote member data + version

[jleandroperez]

This issue has been solved in this pull request