[Delta][Python] Make delta exceptions derive from DeltaConcurrentModficationException

[johnnyg]

Which Delta project/connector is this regarding?

• [ ] Spark
• [ ] Standalone
• [ ] Flink
• [ ] Kernel
• [x] Other (Delta)

Description

Made the delta exceptions derive from DeltaConcurrentModficationException to align with what's done in Scala. This also makes it easy to check/catch all of the delta concurrent related exceptions. Also removed an exception conversion as the scala equivalent class is abstract meaning it can never be instantiated.

How was this patch tested?

Shouldn't have any functional difference so will be covered by existing tests.

Does this PR introduce any user-facing changes?

Yes, users will now be able to catch all the delta exceptions by doing something like:

try:
    delta_operation()
except delta.exceptions.DeltaConcurrentModificationException as e:
    ...