String import/export specifier (#12091)

* feat: parse moduleExportName
* feat: add validators
* Support string specifier name in commonjs transform
* Support string specifier name in export-ns-from
* test: add loose testcases
* test: add testcases for amd and umd
* feat: support systemjs
* test: update fixtures fixed in #12110
* add plugin name typings
* test: rename test layout
* feat: implement under moduleStringNames flag
* chore: add plugin syntax module string names
* feat: support ModuleExportName as ModuleExportName
* test: update test fixtures
* fix flow errors
* docs: update AST spec
* feat: support { "some imports" as "some exports" }
* feat: support { "some imports" as "some exports" } in systemjs
* test: add test on `import { "foo" }`
* Address review comments
* add moduleStringNames to missing plugin helpers
* Apply suggestions from code review
* update test fixtures
* Update packages/babel-parser/src/parser/error-message.js
* update test fixtures

Co-Authored-By: Kai Cataldo <kai@kaicataldo.com>
Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-plugin-syntax-module-string-names/.npmignore

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+*.log
+src
+test

packages/babel-plugin-syntax-module-string-names/README.md

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+# @babel/plugin-syntax-module-string-names
+
+> Allow parsing `import { 'any unicode' as bar }` and `export { foo as 'any unicode' }`"
+
+See our website [@babel/plugin-syntax-module-string-names](https://babeljs.io/docs/en/next/babel-plugin-syntax-module-string-names.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-syntax-module-string-names
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-syntax-module-string-names --dev
+```

packages/babel-plugin-syntax-module-string-names/package.json

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+{
+  "name": "@babel/plugin-syntax-module-string-names",
+  "version": "0.0.0",
+  "description": "Allow parsing `import { 'any unicode' as bar }` and `export { foo as 'any unicode' }`",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-syntax-module-string-names"
+  },
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "exports": "./lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "workspace:^7.10.4"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "workspace:^7.10.4"
+  }
+}

packages/babel-plugin-syntax-module-string-names/src/index.js

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+import { declare } from "@babel/helper-plugin-utils";
+
+export default declare(api => {
+  api.assertVersion(7);
+
+  return {
+    name: "syntax-module-string-names",
+
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("moduleStringNames");
+    },
+  };
+});