[import()] Initial support for dynamic-import (#4699)

* [import()] Initial support for function-like import

* [import()] Renaming import-functions to dynamic-import

* [stage-2] Fixing lint error

* add to package.json

packages/babel-plugin-syntax-dynamic-import/src/index.js

@@ -0,0 +1,7 @@
+export default function () {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("dynamicImport");
+    }
+  };
+}