COMPAT: tzawareness check behavior is different from stdlib

[jbrockmendel]

Timestamp comparisons raise TypeError in some cases where datetimes do not:

ts = pd.Timestamp.now()
ts2 = ts.tz_localize("UTC")
dt = ts.to_pydatetime()
dt2 = ts2.to_pydatetime()

>>> ts == ts2   # <-- TypeError
>>> dt == dt2
False

The datetime comparison will raise for inequalities, just not == or !=.

Changing this behavior would be an API change, but it would likely simplify a bunch of headaches (including a bug in array_equivalent)

[TomAugspurger]

Matching the stdlib makes sense here.

[jreback]

yeah this would be ok to change (its sligthly user facing so would need a note)