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/src/theme/constants/BackgroundLight.ts

@@ -0,0 +1,27 @@
+/* eslint-disable @nx/workspace-no-hardcoded-colors */
+import LightNoise from '../assets/light-noise.png';
+
+import { COLOR } from './Colors';
+import { GRAY_SCALE } from './GrayScale';
+import { RGBA } from './Rgba';
+
+export const BACKGROUND_LIGHT = {
+  noisy: `url(${LightNoise.toString()});`,
+  primary: GRAY_SCALE.gray0,
+  secondary: GRAY_SCALE.gray10,
+  tertiary: GRAY_SCALE.gray15,
+  quaternary: GRAY_SCALE.gray20,
+  danger: COLOR.red10,
+  transparent: {
+    primary: RGBA(GRAY_SCALE.gray0, 0.8),
+    secondary: RGBA(GRAY_SCALE.gray10, 0.8),
+    strong: RGBA(GRAY_SCALE.gray100, 0.16),
+    medium: RGBA(GRAY_SCALE.gray100, 0.08),
+    light: RGBA(GRAY_SCALE.gray100, 0.04),
+    lighter: RGBA(GRAY_SCALE.gray100, 0.02),
+    danger: RGBA(COLOR.red, 0.08),
+  },
+  overlay: RGBA(GRAY_SCALE.gray80, 0.8),
+  radialGradient: `radial-gradient(50% 62.62% at 50% 0%, #505050 0%, ${GRAY_SCALE.gray60} 100%)`,
+  radialGradientHover: `radial-gradient(76.32% 95.59% at 50% 0%, #505050 0%, ${GRAY_SCALE.gray60} 100%)`,
+};