Feat: github connector (#12292)

### What problem does this PR solve?

Feat: github connector

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

common/data_source/github/utils.py

@@ -0,0 +1,46 @@
+import logging
+from collections.abc import Callable
+from typing import cast
+
+from github import Github
+from github.Repository import Repository
+
+from common.data_source.models import ExternalAccess
+
+from .models import SerializedRepository
+
+
+def get_external_access_permission(
+    repo: Repository, github_client: Github
+) -> ExternalAccess:
+    """
+    Get the external access permission for a repository.
+    This functionality requires Enterprise Edition.
+    """
+    # RAGFlow doesn't implement the Onyx EE external-permissions system.
+    # Default to private/unknown permissions.
+    return ExternalAccess.empty()
+
+
+def deserialize_repository(
+    cached_repo: SerializedRepository, github_client: Github
+) -> Repository:
+    """
+    Deserialize a SerializedRepository back into a Repository object.
+    """
+    # Try to access the requester - different PyGithub versions may use different attribute names
+    try:
+        # Try to get the requester using getattr to avoid linter errors
+        requester = getattr(github_client, "_requester", None)
+        if requester is None:
+            requester = getattr(github_client, "_Github__requester", None)
+        if requester is None:
+            # If we can't find the requester attribute, we need to fall back to recreating the repo
+            raise AttributeError("Could not find requester attribute")
+
+        return cached_repo.to_Repository(requester)
+    except Exception as e:
+        # If all else fails, re-fetch the repo directly
+        logging.warning("Failed to deserialize repository: %s. Attempting to re-fetch.", e)
+        repo_id = cached_repo.id
+        return github_client.get_repo(repo_id)