feat(connectors): add base connector and registry for detection

Idea is to have a "plugin-type" system, where new connectors can extend the `BaseConnector` class and implement the fetch posts method.

These are automatically detected by the registry, and automatically used in new Flask endpoints that give a list of possible sources.

Allows for an open-ended system where new data scrapers / API consumers can be added dynamically.

server/app.py

@@ -111,6 +111,20 @@ def get_user_datasets():
     current_user = int(get_jwt_identity())
     return jsonify(dataset_manager.get_user_datasets(current_user)), 200
 
+@app.route("/datasets/sources", methods=["GET"])
+@jwt_required()
+def get_dataset_sources():
+    return jsonify({""})
+
+@app.route("/datasets/scrape", methods=["POST"])
+@jwt_required()
+def scrape_data():
+    if "sources" not in request.form:
+        return jsonify({"error": "Data source names are required."}), 400
+    
+    sources = request.form.get("sources")
+
+
 @app.route("/datasets/upload", methods=["POST"])
 @jwt_required()
 def upload_data():