core: add hpi query command (#157)

- restructure query code for cli, some test fixes
- initial query_range implementation

    refactored functions in query some more
    to allow re-use in range_range, select()
    pretty much just calls out to a bunch
    of handlers now

my/time/tz/via_location.py

@@ -140,7 +140,7 @@ def localize(dt: datetime) -> tzdatetime:
 
 from ...core import stat, Stats
 def stats() -> Stats:
-    from ...core.common import fromisoformat
+    from ...core.compat import fromisoformat
     # TODO not sure what would be a good stat() for this module...
     # might be nice to print some actual timezones?
     # there aren't really any great iterables to expose