Add list stream permission to all roles (#464)

This is useful for the console to list all streams 
but users will only still see the streams that they have
access to.

Author: trueleo

server/src/rbac/role.rs

@@ -164,6 +164,7 @@ pub mod model {
             actions: vec![
                 Action::Ingest,
                 Action::Query,
+                Action::ListStream,
                 Action::GetSchema,
                 Action::GetStats,
                 Action::GetRetention,
@@ -179,6 +180,7 @@ pub mod model {
         RoleBuilder {
             actions: vec![
                 Action::Query,
+                Action::ListStream,
                 Action::GetSchema,
                 Action::GetStats,
                 Action::GetRetention,