ENH: evaluate datetime ops in python space with eval
TST: test nondate vs. date comparisons in query
TST: add test for multiindex resolver naming
ENH: convert all datetime-like objects to Timestamp
CLN: move resolvers getter to generic.py
PERF: add vbench for datetime comparisons
Merge pull request #4924 from cpcloud/eval-datetime-in-python

ENH: evaluate datetime ops in python with eval