DocumentLoader for GitHub (#5408)

# Creates GitHubLoader (#5257)

GitHubLoader is a DocumentLoader that loads issues and PRs from GitHub.

Fixes #5257

---------

Co-authored-by: Dev 2049 <dev.dev2049@gmail.com>

tests/integration_tests/document_loaders/test_github.py

@@ -0,0 +1,12 @@
+from langchain.document_loaders.github import GitHubIssuesLoader
+
+
+def test_issues_load() -> None:
+    title = "DocumentLoader for GitHub"
+    loader = GitHubIssuesLoader(
+        repo="hwchase17/langchain", creator="UmerHA", state="all"
+    )
+    docs = loader.load()
+    titles = [d.metadata["title"] for d in docs]
+    assert title in titles
+    assert all(doc.metadata["creator"] == "UmerHA" for doc in docs)