route REST endpoint & GraphQL resolver: add filtering by serves_stop_onestop_id

[drewda]

No description provided.

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Generated Code Changes Required

The following files may need to be regenerated. Please run go generate ./... and commit the changes:

diff --git a/doc/openapi/rest.json b/doc/openapi/rest.json
index 14c069f..4e426b6 100644
--- a/doc/openapi/rest.json
+++ b/doc/openapi/rest.json
@@ -114,7 +114,7 @@
         }
       },
       "includeRoutesParam": {
-        "description": "Include routes that serve this stop (requires tl_user_pro role)",
+        "description": "Include routes that serve this stop",
         "in": "query",
         "name": "include_routes",
         "schema": {
@@ -129,8 +129,7 @@
             "description": "include_routes=true",
             "url": "include_routes=true"
           }
-        ],
-        "x-required-role": "tl_user_pro"
+        ]
       },
       "includeStopsParam": {
         "description": "Include stops in response",