feat: type-check stories during Storybook build (#876)

- add `check: true` to Storybook TS config
  - which runs `fork-ts-checker-webpack-plugin` to check types
     asynchronously in a separate process during Storybook build

Co-authored-by: Anton Gilgur <[email protected]>

Author: kylemh

templates/react-with-storybook/.storybook/main.js

@@ -1,4 +1,8 @@
 module.exports = {
   stories: ['../stories/**/*.stories.@(ts|tsx|js|jsx)'],
   addons: ['@storybook/addon-links', '@storybook/addon-essentials'],
+  // https://storybook.js.org/docs/react/configure/typescript#mainjs-configuration
+  typescript: {
+    check: true, // type-check stories during Storybook build
+  }
 };