Add application credentials platform (#69148)

* Initial developer credentials scaffolding
- Support websocket list/add/delete
- Add developer credentials protocol from yaml config
- Handle OAuth credential registration and de-registration
- Tests for websocket and integration based registration

* Fix pydoc text

* Remove translations and update owners

* Update homeassistant/components/developer_credentials/__init__.py

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

* Update homeassistant/components/developer_credentials/__init__.py

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

* Remove _async_get_developer_credential

* Rename to application credentials platform

* Fix race condition and add import support

* Increase code coverage (92%)

* Increase test coverage 93%

* Increase test coverage (94%)

* Increase test coverage (97%)

* Increase test covearge (98%)

* Increase test coverage (99%)

* Increase test coverage (100%)

* Remove http router frozen comment

* Remove auth domain override on import

* Remove debug statement

* Don't import the same client id multiple times

* Add auth dependency for local oauth implementation

* Revert older oauth2 changes from merge

* Update homeassistant/components/application_credentials/__init__.py

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

* Move config credential import to its own fixture

* Override the mock_application_credentials_integration fixture instead per test

* Update application credentials

* Add dictionary typing

* Use f-strings as per feedback

* Add additional structure needed for an MVP application credential

Add additional structure needed for an MVP, including a target
component Xbox

* Add websocket to list supported integrations for frontend selector

* Application credentials config

* Import xbox credentials

* Remove unnecessary async calls

* Update script/hassfest/application_credentials.py

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

* Update script/hassfest/application_credentials.py

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

* Update script/hassfest/application_credentials.py

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

* Update script/hassfest/application_credentials.py

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

* Import credentials with a fixed auth domain

Resolve an issue with compatibility of exisiting config entries when importing
client credentials

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

script/hassfest/__main__.py

@@ -5,6 +5,7 @@ import sys
 from time import monotonic
 
 from . import (
+    application_credentials,
     codeowners,
     config_flow,
     coverage,
@@ -25,6 +26,7 @@ from . import (
 from .model import Config, Integration
 
 INTEGRATION_PLUGINS = [
+    application_credentials,
     codeowners,
     config_flow,
     dependencies,