PERF: make _Tick into a cdef class
The actual "PERF" part is that in the follow-up we can cimport `is_tick_object` which will be appreciably faster than the `getattr(other, "_typ", None) == "dateoffset" and hasattr(other, "delta")` checks we now do
also assume we have sufficient benchmarks on this (e.g. how you found this at some point)