Date param support

[clickingbuttons]

Support date for all date string query parameters. Supporting dates doesn't require any code changes (just type changes) since we already call str() on params:

>>> str(date(2020,3,3))
'2020-03-03

For quotes and trades we also support int and datetime as nanos since epoch. I wrote a helper time_mult(timestamp_res: str) -> int for it.

Also add verbose=true option for request debugging.