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/.storybook/preview-head.html

@@ -0,0 +1,34 @@
+<link
+  href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap"
+  rel="stylesheet"
+/>
+
+<script src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/4.3.7/iframeResizer.contentWindow.min.js"></script>
+
+<style type="text/css">
+body {
+  margin: 0;
+  font-family: 'Inter', sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+html {
+  font-size: 13px;
+}
+.sbdocs-wrapper {
+  padding: 0 !important;
+}
+*::-webkit-scrollbar {
+    height: 4px;
+    width: 4px;
+  }
+
+  *::-webkit-scrollbar-corner {
+    background-color: transparent;
+  }
+
+  *::-webkit-scrollbar-thumb {
+    background-color: transparent;
+    border-radius: 2px;
+  }
+</style>