REF: implement ABCTimestamp, ABCTimedelta, ABCTick #34054
Merged
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Motivation: to make more progress on getting DateOffset into cython, we need to be able to import Timestamp into liboffsets. ATM that would induce circular dependencies.
This allows us to merge c_timestamp back into timestamps.pyx; the initial motivation for that was to be able to cimport _Timestamp into libconversion.
In a follow-up we can use this pattern to make a faster
is_interval
check (that doesnt have to go through python-space)