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/application_credentials.py

@@ -0,0 +1,63 @@
+"""Generate application_credentials data."""
+from __future__ import annotations
+
+import json
+
+from .model import Config, Integration
+
+BASE = """
+\"\"\"Automatically generated by hassfest.
+
+To update, run python3 -m script.hassfest
+\"\"\"
+
+# fmt: off
+
+APPLICATION_CREDENTIALS = {}
+""".strip()
+
+
+def generate_and_validate(integrations: dict[str, Integration], config: Config) -> str:
+    """Validate and generate config flow data."""
+
+    match_list = []
+
+    for domain in sorted(integrations):
+        integration = integrations[domain]
+        application_credentials_file = integration.path / "application_credentials.py"
+        if not application_credentials_file.is_file():
+            continue
+
+        match_list.append(domain)
+
+    return BASE.format(json.dumps(match_list, indent=4))
+
+
+def validate(integrations: dict[str, Integration], config: Config) -> None:
+    """Validate application_credentials data."""
+    application_credentials_path = (
+        config.root / "homeassistant/generated/application_credentials.py"
+    )
+    config.cache["application_credentials"] = content = generate_and_validate(
+        integrations, config
+    )
+
+    if config.specific_integrations:
+        return
+
+    if application_credentials_path.read_text(encoding="utf-8").strip() != content:
+        config.add_error(
+            "application_credentials",
+            "File application_credentials.py is not up to date. Run python3 -m script.hassfest",
+            fixable=True,
+        )
+
+
+def generate(integrations: dict[str, Integration], config: Config):
+    """Generate application_credentials data."""
+    application_credentials_path = (
+        config.root / "homeassistant/generated/application_credentials.py"
+    )
+    application_credentials_path.write_text(
+        f"{config.cache['application_credentials']}\n", encoding="utf-8"
+    )