feat: add tracking endpoint and IP address service

Introduce a new tracking endpoint in `com_tracardi/endpoint/track.py`
to handle tracking events. Add IP address extraction logic in
`tracardi/service/ip_address.py` to support tracking from reverse proxy
headers. Integrate the tracking endpoint into the application in
`app/main.py`. Update `app/api/track/event_server_endpoint.py` to use
the new IP address service.

tracardi/service/ip_address.py

@@ -0,0 +1,13 @@
+from tracardi.config import server
+
+
+def get_ip_address(request) -> str:
+
+    """
+    Returns IP address - if address is forwarded from reverse proxy it takes USE_X_FORWARDED_IP env to figure out
+    where the forwarded ip is stored in headers.
+    """
+
+    if server.x_forwarded_ip_header is not None and server.x_forwarded_ip_header in request.headers:
+        return request.headers[server.x_forwarded_ip_header]
+    return request.client.host