Setup the foundation for Twenty UI library. (#4423)

* feat: create a separate package for twenty-ui, extract the pill component with hard-coded theme values into it, and use the component inside twenty-front to complete the setup

* feat: extract the light and the dark theme into twenty-ui and update the AppThemeProvider component inside twenty-front to consume themes from twenty-ui

* fix: create a decorator inside preview.tsx to provide a default theme to storybook development server

* fix: remove redundant type declarations and revert back the naming convention for theme declarations

* fix: introduce a default value for pill label within the story for development server

* fix: introduce the nx script into package.json for twenty-ui and resolve imports for theme type within the package

* fix: remove the pill component from the twenty-front package along with the story for it

* fix: revert the package versions to those before running the nx cli command for storybook init

* feat: update readme to include details for building the ui library and starting the storybook development server

* fix: include details about twenty-ui inside jest.config for twenty-front to complete front-jest job

* - Added preview head for font
- Added theme addon for light/dark switch
- Added ComponentDecorator

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-ui/vite.config.ts

@@ -0,0 +1,47 @@
+/// <reference types='vitest' />
+import { nxViteTsPaths } from '@nx/vite/plugins/nx-tsconfig-paths.plugin';
+import * as path from 'path';
+import { defineConfig } from 'vite';
+import dts from 'vite-plugin-dts';
+
+export default defineConfig({
+  root: __dirname,
+  cacheDir: '../../node_modules/.vite/packages/twenty-ui',
+
+  plugins: [
+    nxViteTsPaths(),
+    dts({
+      entryRoot: 'src',
+      tsConfigFilePath: path.join(__dirname, 'tsconfig.lib.json'),
+      skipDiagnostics: true,
+    }),
+  ],
+
+  // Uncomment this if you are using workers.
+  // worker: {
+  //  plugins: [ nxViteTsPaths() ],
+  // },
+
+  // Configuration for building your library.
+  // See: https://vitejs.dev/guide/build.html#library-mode
+  build: {
+    outDir: './dist',
+    reportCompressedSize: true,
+    commonjsOptions: {
+      transformMixedEsModules: true,
+    },
+    lib: {
+      // Could also be a dictionary or array of multiple entry points.
+      entry: 'src/index.ts',
+      name: 'twenty-ui',
+      fileName: 'index',
+      // Change this to the formats you want to support.
+      // Don't forget to update your package.json as well.
+      formats: ['es', 'cjs'],
+    },
+    rollupOptions: {
+      // External packages that should not be bundled into your library.
+      external: [],
+    },
+  },
+});