Add config flow to transmission (#26434)

* Add config flow to transmission

* Reworked code to add all sensors and switches

* applied fixes

* final touches

* Add tests

* fixed tests

* fix get_api errors and entities availabilty update

* update config_flows.py

* fix pylint error

* update .coveragerc

* add codeowner

* add test_options

* fixed test_options

homeassistant/components/transmission/const.py

@@ -0,0 +1,24 @@
+"""Constants for the Transmission Bittorent Client component."""
+DOMAIN = "transmission"
+
+SENSOR_TYPES = {
+    "active_torrents": ["Active Torrents", None],
+    "current_status": ["Status", None],
+    "download_speed": ["Down Speed", "MB/s"],
+    "paused_torrents": ["Paused Torrents", None],
+    "total_torrents": ["Total Torrents", None],
+    "upload_speed": ["Up Speed", "MB/s"],
+    "completed_torrents": ["Completed Torrents", None],
+    "started_torrents": ["Started Torrents", None],
+}
+SWITCH_TYPES = {"on_off": "Switch", "turtle_mode": "Turtle Mode"}
+
+DEFAULT_NAME = "Transmission"
+DEFAULT_PORT = 9091
+DEFAULT_SCAN_INTERVAL = 120
+
+ATTR_TORRENT = "torrent"
+SERVICE_ADD_TORRENT = "add_torrent"
+
+DATA_UPDATED = "transmission_data_updated"
+DATA_TRANSMISSION = "data_transmission"