Split config.py into multiple files (#14038)

* Replace logging.warn with logging.warning

* Install config global state early

* Split config.py into more manageable pieces

frigate/config/proxy.py

@@ -0,0 +1,28 @@
+from typing import Optional
+
+from pydantic import Field
+
+from .base import FrigateBaseModel
+from .env import EnvString
+
+__all__ = ["ProxyConfig", "HeaderMappingConfig"]
+
+
+class HeaderMappingConfig(FrigateBaseModel):
+    user: str = Field(
+        default=None, title="Header name from upstream proxy to identify user."
+    )
+
+
+class ProxyConfig(FrigateBaseModel):
+    header_map: HeaderMappingConfig = Field(
+        default_factory=HeaderMappingConfig,
+        title="Header mapping definitions for proxy user passing.",
+    )
+    logout_url: Optional[str] = Field(
+        default=None, title="Redirect url for logging out with proxy."
+    )
+    auth_secret: Optional[EnvString] = Field(
+        default=None,
+        title="Secret value for proxy authentication.",
+    )