Tweak and re-organize ESLint config (#38369)

* Tweak and re-organize ESLint config

* merge individual configs to the root config
* enable more eslint-plugin-import rules
* lint markdown files

* Lint

build/banner.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const pkg = require('../package.json')
+
 const year = new Date().getFullYear()
 
 function getBanner(pluginFilename) {