Add HugeGraphQAChain to support gremlin generating chain (#7132)

[Apache HugeGraph](https://github.com/apache/incubator-hugegraph) is a
convenient, efficient, and adaptable graph database, compatible with the
Apache TinkerPop3 framework and the Gremlin query language.

In this PR, the HugeGraph and HugeGraphQAChain provide the same
functionality as the existing integration with Neo4j and enables query
generation and question answering over HugeGraph database. The
difference is that the graph query language supported by HugeGraph is
not cypher but another very popular graph query language
[Gremlin](https://tinkerpop.apache.org/gremlin.html).

A notebook example and a simple test case have also been added.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

tests/integration_tests/graphs/test_hugegraph.py

@@ -0,0 +1,46 @@
+import unittest
+from typing import Any
+from unittest.mock import MagicMock, patch
+
+from langchain.graphs import HugeGraph
+
+
+class TestHugeGraph(unittest.TestCase):
+    def setUp(self) -> None:
+        self.username = "test_user"
+        self.password = "test_password"
+        self.address = "test_address"
+        self.graph = "test_hugegraph"
+        self.port = 1234
+        self.session_pool_size = 10
+
+    @patch("hugegraph.connection.PyHugeGraph")
+    def test_init(self, mock_client: Any) -> None:
+        mock_client.return_value = MagicMock()
+        huge_graph = HugeGraph(
+            self.username, self.password, self.address, self.port, self.graph
+        )
+        self.assertEqual(huge_graph.username, self.username)
+        self.assertEqual(huge_graph.password, self.password)
+        self.assertEqual(huge_graph.address, self.address)
+        self.assertEqual(huge_graph.port, self.port)
+        self.assertEqual(huge_graph.graph, self.graph)
+
+    @patch("hugegraph.connection.PyHugeGraph")
+    def test_execute(self, mock_client: Any) -> None:
+        mock_client.return_value = MagicMock()
+        huge_graph = HugeGraph(
+            self.username, self.password, self.address, self.port, self.graph
+        )
+        query = "g.V().limit(10)"
+        result = huge_graph.query(query)
+        self.assertIsInstance(result, MagicMock)
+
+    @patch("hugegraph.connection.PyHugeGraph")
+    def test_refresh_schema(self, mock_client: Any) -> None:
+        mock_client.return_value = MagicMock()
+        huge_graph = HugeGraph(
+            self.username, self.password, self.address, self.port, self.graph
+        )
+        huge_graph.refresh_schema()
+        self.assertNotEqual(huge_graph.get_schema, "")