standardize packaging, tooling, docs, CI, and licensing

mail_intake/auth/google.pyi

@@ -1,7 +1,11 @@
-from typing import Sequence, Any
+from collections.abc import Sequence
+from typing import Any
+
 from mail_intake.auth.base import MailIntakeAuthProvider
 from mail_intake.credentials.store import CredentialStore
 
 class MailIntakeGoogleAuth(MailIntakeAuthProvider[Any]):
-    def __init__(self, credentials_path: str, store: CredentialStore[Any], scopes: Sequence[str]) -> None: ...
+    def __init__(
+        self, credentials_path: str, store: CredentialStore[Any], scopes: Sequence[str]
+    ) -> None: ...
     def get_credentials(self) -> Any: ...