Disable Typescript async and incremental settings (compile performance testing)

We're trying to solve hanging builds, see discussions here:
* facebook#7003 (comment)
* TypeStrong/fork-ts-checker-webpack-plugin#256

Author: cberkom

packages/react-scripts/config/webpack.config.js

@@ -681,8 +681,8 @@ module.exports = function(webpackEnv) {
           typescript: resolve.sync('typescript', {
             basedir: paths.appNodeModules,
           }),
-          async: isEnvDevelopment,
-          useTypescriptIncrementalApi: true,
+          async: false,
+          useTypescriptIncrementalApi: false,
           checkSyntacticErrors: true,
           resolveModuleNameModule: process.versions.pnp
             ? `${__dirname}/pnpTs.js`

packages/react-scripts/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@leadsimple/react-scripts",
-  "version": "3.1.1-rc.1",
+  "version": "3.1.1-rc.2",
   "description": "Configuration and scripts for Create React App.",
   "repository": "leadsimple/create-react-app",
   "license": "MIT",