Move the shared ESLint plugin/config into the monorepo (#24670)

* Move the shared ESLint plugin/config into the monorepo

* Add peer dependencies to ESLint plugin

webapp/platform/eslint-plugin/index.js

@@ -0,0 +1,21 @@
+"use strict";
+
+module.exports = {
+    configs: {
+        base: {
+            extends: [
+                require.resolve('./configs/.eslintrc.json'),
+            ],
+        },
+        react: {
+            extends: [
+                require.resolve('./configs/.eslintrc.json'),
+                require.resolve('./configs/.eslintrc-react.json'),
+            ],
+        },
+    },
+    rules: {
+        'no-dispatch-getstate': require('./rules/no-dispatch-getstate'),
+        'use-external-link': require('./rules/use-external-link'),
+    },
+};