Add paperless integration (#145239)

* add paperless integration - config flow and initialisation

* Add first sensors - documents, inbox, storage total and available

* Add status sensors with error attributes

* add status coordinator and organized code

* Fixed None error

* Organized code and moved requests to coordinator

* Organized code

* optimized code

* Add statustype state strings

* Error handling

* Organized code

* Add update sensor and one coordinator for integration

* add sanity sensor and timer for version request

* Add sensors and icons.json. better errorhandling

* Add tests and error handling

* FIxed tests

* Add tests for coverage

* Quality scale

* Stuff

* Improved code structure

* Removed sensor platform and reauth / reconfigure flow

* bump pypaperless to 4.1.0

* Optimized tests; update sensor as update platform; little optimizations

* Code optimizations with update platform

* Add sensor platform

* Removed update platform

* quality scale

* removed unused const

* Removed update snapshot; better code

* Changed name of entry

* Fixed bugs

* Minor changes

* Minor changed and renamed sensors

* Sensors to measurement

* Fixed snapshot; test data to json; minor changes

* removed mypy errors

* Changed translation

* minor changes

* Update homeassistant/components/paperless_ngx/strings.json

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Co-authored-by: Josef Zweck <josef@zweck.dev>
Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

CODEOWNERS

@@ -1140,6 +1140,8 @@ build.json @home-assistant/supervisor
 /tests/components/palazzetti/ @dotvav
 /homeassistant/components/panel_custom/ @home-assistant/frontend
 /tests/components/panel_custom/ @home-assistant/frontend
+/homeassistant/components/paperless_ngx/ @fvgarrel
+/tests/components/paperless_ngx/ @fvgarrel
 /homeassistant/components/peblar/ @frenck
 /tests/components/peblar/ @frenck
 /homeassistant/components/peco/ @IceBotYT