Build: implement useBootstrapStdlib flag

Excludes stdlib projects from build and uses bootstrap stdlib artifacts

 #KT-29205

libraries/commonConfiguration.gradle

@@ -215,3 +215,9 @@ ext.configurePublishing = { Project project ->
     }
 
 }
+
+allprojects { project ->
+    dependencies.ext.kotlinStdlib = { suffix ->
+        DependenciesKt.kotlinStdlib(project, suffix)
+    }
+}