feat: couchbase integration (#6165)

Co-authored-by: crazywoola <427733928@qq.com>
Co-authored-by: Elliot Scribner <elliot.scribner@couchbase.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: Bowen Liang <bowenliang@apache.org>

api/configs/middleware/vdb/couchbase_config.py

@@ -0,0 +1,34 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+class CouchbaseConfig(BaseModel):
+    """
+    Couchbase configs
+    """
+
+    COUCHBASE_CONNECTION_STRING: Optional[str] = Field(
+        description="COUCHBASE connection string",
+        default=None,
+    )
+
+    COUCHBASE_USER: Optional[str] = Field(
+        description="COUCHBASE user",
+        default=None,
+    )
+
+    COUCHBASE_PASSWORD: Optional[str] = Field(
+        description="COUCHBASE password",
+        default=None,
+    )
+
+    COUCHBASE_BUCKET_NAME: Optional[str] = Field(
+        description="COUCHBASE bucket name",
+        default=None,
+    )
+
+    COUCHBASE_SCOPE_NAME: Optional[str] = Field(
+        description="COUCHBASE scope name",
+        default=None,
+    )