Add syncthing integration (#38331)

* Scaffold the integration

* Add config flow data schema

* Handle configuration errors

* Get folder states

* Support https

* Fix translations

* Listen to syncthing events in a separate thread

* Bump syncthing

* Automatically reconnect to the syncthing server

* Renames

* Improve loading and unloading

* Update folder states from events

* Refactoring, handle FolderPaused event

* Dynamic folder icons

* Refactoring

* Mark folders as unavailable when senrver is unavailable

* Update folder satus when server is available

* Raise PlatformNotReady

* Implement additional polling

* Stop polling when the server is not available

* Minor fixes

* Remove logging

* Check name uniqueness

* Refactoring

* Minor refactorings

* Bump python-syncthing

* Migrate to aiosyncthing

* Minor fixes

* Update .coveragerc

* Set quality scale

* Bump aiosyncthing, properly handle invalid token

* Fix logging

* Fix logging

* Use CONF_VERIFY_SSL from homeassistant.const

* Bump aiosyncthing. Add Syncthing device

* Fix device name

* Bump aiosyncthing

* Bump aiosyncthing

* Extract SyncthingClient

* Add folder to device_state_attributes

* Do not pass the loop

* Cover config_flow.py

* Move self.async_create_entry outside of the try block

* Raise ConfigEntryNotReady if syncthing server is not reachable

* Fix already configured error message

* Change default name to Syncthing

* Bump aiosyncthing

* Fix formatting

* Fix formatting

* Fix tests

* Fix typo, use lis comprehension

* Fix typo, remove unused CONFIG_SCHEMA

* Bump aiosyncthing

* Remove periods from log messages W0001

* Fix tests

* Black, isort

* Remove empty items from manifest.json

* Fix variable naming

* Remove async_setup

* Use SensorEntity

* Use asyncio.create_task instead of self._hass.loop.create_task

* Do not pass hass to FolderSensor initializer

* Rename device_state_attributes to extra_state_attributes

* Use callbacks

* Simplify tests

* Refactor _listen()

* Use url for the title

* Use the url instead of the name to identify the config entry

* Explicitly set sensor attributes, extract _filter_state

* Use server url instead of name in device_info

* Use server url instead of name in logs

* User server id as a device identifier

* Use URL instead of name to identify config entry

* Use shortened server id instead of name to build entity name and unique id

* Do not use CONF_NAME

* Cleanup unused strings

* Cleanup unused strings

* Add IOT class

* Scaffold the integration

* Add config flow data schema

* Handle configuration errors

* Get folder states

* Support https

* Fix translations

* Listen to syncthing events in a separate thread

* Bump syncthing

* Automatically reconnect to the syncthing server

* Renames

* Improve loading and unloading

* Update folder states from events

* Refactoring, handle FolderPaused event

* Dynamic folder icons

* Refactoring

* Mark folders as unavailable when senrver is unavailable

* Update folder satus when server is available

* Raise PlatformNotReady

* Implement additional polling

* Stop polling when the server is not available

* Minor fixes

* Remove logging

* Check name uniqueness

* Refactoring

* Minor refactorings

* Bump python-syncthing

* Migrate to aiosyncthing

* Minor fixes

* Update .coveragerc

* Set quality scale

* Bump aiosyncthing, properly handle invalid token

* Fix logging

* Fix logging

* Use CONF_VERIFY_SSL from homeassistant.const

* Bump aiosyncthing. Add Syncthing device

* Fix device name

* Bump aiosyncthing

* Bump aiosyncthing

* Extract SyncthingClient

* Add folder to device_state_attributes

* Do not pass the loop

* Cover config_flow.py

* Move self.async_create_entry outside of the try block

* Raise ConfigEntryNotReady if syncthing server is not reachable

* Fix already configured error message

* Change default name to Syncthing

* Bump aiosyncthing

* Fix formatting

* Fix formatting

* Fix tests

* Fix typo, use lis comprehension

* Fix typo, remove unused CONFIG_SCHEMA

* Bump aiosyncthing

* Remove periods from log messages W0001

* Fix tests

* Black, isort

* Remove empty items from manifest.json

* Fix variable naming

* Remove async_setup

* Use SensorEntity

* Use asyncio.create_task instead of self._hass.loop.create_task

* Do not pass hass to FolderSensor initializer

* Rename device_state_attributes to extra_state_attributes

* Use callbacks

* Simplify tests

* Refactor _listen()

* Use url for the title

* Use the url instead of the name to identify the config entry

* Explicitly set sensor attributes, extract _filter_state

* Use server url instead of name in device_info

* Use server url instead of name in logs

* User server id as a device identifier

* Use URL instead of name to identify config entry

* Use shortened server id instead of name to build entity name and unique id

* Do not use CONF_NAME

* Cleanup unused strings

* Cleanup unused strings

* Add IOT class

* Apply suggestions from code review

* Clean up

* Fix dict comprehension

* Clean sensor

* Use the server ID as a config entry unique ID

* Remove the AlreadyConfigured exception

* Clean up old error string

* Format json

* Convert sensor attributes to snake case

* Force CI

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>