Add Proto Fields for listing pending runners (#589)

* Add State to RunnerInfo

* add list_pending option to request

* add list_pending arg to ListAliasRunnersRequest

* proto compile

* change state to enum type

Author: Warlord-K

projects/isolate_proto/src/isolate_proto/controller.proto

@@ -326,6 +326,7 @@ message ListSecretsResponse {
 
 message ListAliasRunnersRequest {
     string alias = 1;
+    optional bool list_pending = 2;
 }
 
 message ListAliasRunnersResponse {
@@ -340,14 +341,22 @@ message RunnerInfo {
     string revision = 6;
     string alias = 7;
     optional google.protobuf.Struct external_metadata = 5;
+
+    enum State {
+        RUNNING = 0;
+
+        PENDING = 1;
+    }
+
+    optional State state = 8;
 }
 
 message KillRunnerRequest {
     string runner_id = 1;
 }
 
 message ListRunnersRequest {
-    // Empty. For future use.
+    optional bool list_pending = 1;
 }
 
 message ListRunnersResponse {