Merge kotlin-experimental into kotlin standard library (KT-23055 fixed)

* kotlin-experimental.js has been already merged into kotlin.js
* change library name to kotlin in kotlin-experimental.meta.js in order to produce correct require calls
* concatenate kotlin-experimental.meta.js with kotlin.meta.js
* suppress multiple module declaration warning for such use case

jps-plugin/testData/general/KotlinJavaScriptProjectWithLibrary/expected-output.txt

@@ -11,8 +11,6 @@ kotlinProject/
     file0.js
     jslib-example.js
     jslib-example.meta.js
-    kotlin-experimental.js
-    kotlin-experimental.meta.js
     kotlin.js
     kotlin.meta.js
     res0.js