core.common: move stats-related stuff to my.core.stats and add more thorough tests/docs

deprecate core.common.stat and core.common.Stats with backwards compatibility

my/location/google.py

@@ -19,6 +19,7 @@ import re
 # pip3 install geopy
 import geopy # type: ignore
 
+from my.core import stat, Stats
 from my.core.common import LazyLogger
 from my.core.cachew import cache_dir, mcachew
 
@@ -164,7 +165,6 @@ def locations(**kwargs) -> Iterable[Location]:
     return _iter_locations(path=last_takeout, **kwargs)
 
 
-from ..core.common import stat, Stats
 def stats() -> Stats:
     return stat(locations)
 

my/location/google_takeout.py

@@ -9,8 +9,8 @@ from typing import Iterator
 from my.google.takeout.parser import events, _cachew_depends_on
 from google_takeout_parser.models import Location as GoogleLocation
 
+from my.core import stat, Stats, LazyLogger
 from my.core.cachew import mcachew
-from my.core.common import LazyLogger, stat, Stats
 from .common import Location
 
 logger = LazyLogger(__name__)

my/location/google_takeout_semantic.py

@@ -12,9 +12,8 @@ from typing import Iterator, List
 from my.google.takeout.parser import events, _cachew_depends_on as _parser_cachew_depends_on
 from google_takeout_parser.models import PlaceVisit as SemanticLocation
 
-from my.core import dataclass, make_config
+from my.core import dataclass, make_config, stat, LazyLogger, Stats
 from my.core.cachew import mcachew
-from my.core.common import LazyLogger, Stats, stat
 from my.core.error import Res
 from .common import Location