update collector to listen on all interfaces (#1685)

by default, the collector only listens on localhost now, and so is not reachable from
dev containers when running examples

Author: brettmc

files/collector/otel-collector-config.yml

@@ -2,7 +2,9 @@ receivers:
   otlp:
     protocols:
       grpc:
+        endpoint: "0.0.0.0:4317"
       http:
+        endpoint: "0.0.0.0:4318"
   zipkin:
 
 exporters: