Add OrStatus, improve error propagation for AndStatus

[cappel89]

Summary

This PR adds an OrStatus objects and slightly improves error handling in the AndStatus. It was separated and refactored based on comments in #1265 (#1265 (comment)).

Use Case

In some cases, multiple status objects are created from methods or set calls. In some cases, it can be preferable to combine these status objects to hand them over to a different section in the code. This was already possible with the AndStatus object, however, the error handling in case of a failure was not optimal as the actual Exception leading to the status to fail was not properly propagated. This PR fixes this. In addition, a second option was added to combine status objects with a logical or. Here, the idea is that it will resolve in success if any of the status objects succeeds, and only fails if a single status object fails.

AndStatus

st1 = StatusBase()
st2 = StatusBase()
st3 = DeviceStatus(dev)
and_status = st1 & st2 & st3

and_status.done # is False
st1.set_exception(Exception("Test exception"))
and_status.done # is True
and_status.exception() # is Exception("Test exception")

OrStatus

st1 = StatusBase()
st2 = StatusBase()
st3 = DeviceStatus(dev)
or_status = st1 | st2 | st3

st1.set_exception(Exception("Test exception"))
or_status.done # is False
st2.set_exception(TimeoutError("Test exception"))
or_status.done # is False
st3.set_exception(RuntimeError("Test exception"))
or_status.done # is True
or_status.exception() # is RuntimeError('RuntimeError: Exception: Test exception; TimeoutError: Test exception; RuntimeError: Test exception')

[cappel89]

@tacaswell
Thanks for the insides on the AndStatus. By itself it 'almost' serves the purpose that we wanted to have.
I used your input from the AndAllStatus, and improved that the exception from sub-statuses is propagated to the AndStatus, which for me was missing in the current implementation.
Besides that, I added in the same fashion the OrStatus, and also added an or method to StatusBase, which should now work with the same syntax. Please let me know your thoughts.