Create dt_geo.py (#2858)

* Create dt_geo.py

creating python code snippets for the geospatial data type page

* Update dt_geo.py

update for linter

* Update dt_geo.py

local lint of `black --line-length 80 dt_geo.py` passes

* add remove keywords

remove the cleanup code from ever being visible to the user

* add newline for linter

doctests/dt_geo.py

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+# EXAMPLE: geo_tutorial
+# HIDE_START
+import redis
+
+r = redis.Redis(decode_responses=True)
+# HIDE_END
+# REMOVE_START
+r.delete("bikes:rentable")
+# REMOVE_END
+
+# STEP_START geoadd
+res1 = r.geoadd("bikes:rentable", [-122.27652, 37.805186, "station:1"])
+print(res1)  # >>> 1
+
+res2 = r.geoadd("bikes:rentable", [-122.2674626, 37.8062344, "station:2"])
+print(res2)  # >>> 1
+
+res3 = r.geoadd("bikes:rentable", [-122.2469854, 37.8104049, "station:3"])
+print(res3)  # >>> 1
+# STEP_END
+
+# REMOVE_START
+assert res1 == 1
+assert res2 == 1
+assert res3 == 1
+# REMOVE_END
+
+# STEP_START geosearch
+res4 = r.geosearch(
+    "bikes:rentable",
+    longitude=-122.27652,
+    latitude=37.805186,
+    radius=5,
+    unit="km",
+)
+print(res4)  # >>> ['station:1', 'station:2', 'station:3']
+# STEP_END
+
+# REMOVE_START
+assert res4 == ["station:1", "station:2", "station:3"]
+# REMOVE_END