Support region in stock search requests (#17)

# Description
Add `region` to stock symbol lookup requests to narrow results to a
market
Include `service` in responses to attribute API provider (currently
Alpha Vantage)

# Issues
Closes #16 

# Other Notes
<!-- Note any breaking changes, WIP changes, requests for input, etc.
here -->

---------

Co-authored-by: Daniel McKnight <daniel@neon.ai>

neon_hana/mq_service_api.py

@@ -52,10 +52,17 @@ def __init__(self, config: dict):
         self.sessions_by_id = dict()
 
     @staticmethod
-    def _validate_api_proxy_response(response: dict):
+    def _validate_api_proxy_response(response: dict, query_params: dict):
         if response['status_code'] == 200:
             try:
                 resp = json.loads(response['content'])
+                if query_params.get('service') == "alpha_vantage":
+                    resp['service'] = query_params['service']
+                    if query_params.get("region") and resp.get('bestMatches'):
+                        filtered = [
+                            stock for stock in resp.get("bestMatches")
+                            if stock.get("4. region") == query_params["region"]]
+                        resp['bestMatches'] = filtered
                 if isinstance(resp, dict):
                     return resp
                 # Reverse Geocode API returns a list; reformat that to a dict
@@ -87,7 +94,7 @@ def query_api_proxy(self, service_name: str, query_params: dict,
         query_params['service'] = service_name
         response = send_mq_request("/neon_api", query_params, "neon_api_input",
                                    "neon_api_output", timeout)
-        return self._validate_api_proxy_response(response)
+        return self._validate_api_proxy_response(response, query_params)
 
     def query_llm(self, llm_name: str, query: str, history: List[tuple]):
         response = send_mq_request("/llm", {"query": query,

neon_hana/schema/api_requests.py

@@ -52,9 +52,11 @@ class WeatherAPIRequest(BaseModel):
 
 class StockAPISymbolRequest(BaseModel):
     company: Optional[str] = None
+    region: Optional[str] = None
     model_config = {
         "json_schema_extra": {
-            "examples": [{"company": "microsoft"}]}}
+            "examples": [{"company": "microsoft",
+                          "region": "United States"}]}}
 
 
 class StockAPIQuoteRequest(BaseModel):

neon_hana/schema/api_responses.py

@@ -1749,6 +1749,7 @@ class StockAPIQuoteResponse(BaseModel):
         "json_schema_extra": {
             "examples": [
                 {
+                    "provider": "alpha_vantage",
                     "Global Quote": {
                         "01. symbol": "GOOG",
                         "02. open": "144.8950",
@@ -1771,6 +1772,7 @@ class StockAPISearchResponse(BaseModel):
         "json_schema_extra": {
             "examples": [
                 {
+                    "provider": "alpha_vantage",
                     "bestMatches": [
                         {
                             "1. symbol": "MSF0.FRK",