[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/.npmignore

@@ -0,0 +1,3 @@
+node_modules
+*.log
+src

packages/babel-plugin-syntax-dynamic-import/README.md

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+# babel-plugin-syntax-dynamic-import
+
+Allow parsing of `import()`.
+
+## Installation
+
+```sh
+$ npm install babel-plugin-syntax-dynamic-import
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["syntax-dynamic-import"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins syntax-dynamic-import script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["syntax-dynamic-import"]
+});
+```

packages/babel-plugin-syntax-dynamic-import/package.json

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+{
+  "name": "babel-plugin-syntax-dynamic-import",
+  "version": "6.13.0",
+  "description": "Allow parsing of import()",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-dynamic-import",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {},
+  "devDependencies": {}
+}

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

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+export default function () {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("dynamicImport");
+    }
+  };
+}