add runRequest and runner utils functions to cli

~ add bru.runRequest support for cli
~ add bru.runner.skipRequest, bru.runner.stopExecution support for cli

packages/bruno-tests/collection/scripting/api/bru/runner/2.bru

@@ -0,0 +1,19 @@
+meta {
+  name: 2
+  type: http
+  seq: 2
+}
+
+post {
+  url: https://echo.usebruno.com
+  body: none
+  auth: none
+}
+
+script:pre-request {
+  bru.runner.skipRequest();
+}
+
+script:post-response {
+  bru.setVar('bru.runner.skipRequest', false);
+}