Add @mailpoet/components package with a dummy testing component

[MAILPOET-5015]

packages/js/components/.gitignore

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+/build
+/build-module

packages/js/components/package.json

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+{
+  "name": "@mailpoet/components",
+  "private": true,
+  "sideEffects": false,
+  "version": "0.1.0",
+  "type": "module",
+  "module": "build-module/index.js",
+  "exports": {
+    ".": {
+      "import": "./build-module/index.js"
+    }
+  },
+  "scripts": {
+    "build": "wp-scripts build",
+    "start": "wp-scripts start"
+  },
+  "peerDependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "@types/react": "18.0.28",
+    "@types/react-dom": "18.0.11",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "volta": {
+    "extends": "../../../package.json"
+  }
+}

packages/js/components/src/dummy/index.tsx

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+export function Dummy(): JSX.Element {
+  return <div>Dummy component</div>;
+}

packages/js/components/src/index.ts

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+export * from './dummy';