Initial my.time.tz provider, infer from location with daily resolution

tox.ini

@@ -17,6 +17,9 @@ commands =
     # my.location.google deps
     pip install geopy ijson
 
+    # my.time.tz.via_location dep
+    pip install timezonefinder
+
     python3 -m pytest                              \
         tests/core.py                              \
         tests/misc.py                              \
@@ -25,7 +28,8 @@ commands =
         tests/config.py::test_environment_variable \
         tests/demo.py                              \
         tests/bluemaestro.py                       \
-        tests/location.py
+        tests/location.py                          \
+        tests/tz.py
     # TODO add; once I figure out porg depdencency?? tests/config.py
     # TODO run demo.py? just make sure with_my is a bit cleverer?
     # TODO e.g. under CI, rely on installing
@@ -63,6 +67,7 @@ commands =
                     -p my.body.exercise.cross_trainer \
                     -p my.bluemaestro                 \
                     -p my.location.google             \
+                    -p my.time.tz.via_location        \
                     --txt-report  .mypy-coverage      \
                     --html-report .mypy-coverage      \
                     {posargs}