Add initial implementation of primary menu

Closes #3456084

This MR adds an initial implementation of the primary menu from the mid-fi wireframes.

Changes:

• Adds new primary menu (left sidebar) using Radix components
  • Radix menubar opens on hover by default, so I needed to override this using event.preventDefault. But to make tooltips work when you hover over an icon, I added an invisible <div/> .overlayForHover right over the icon to be the tooltip trigger. When this invisible div is clicked, it dispatches a PointerEvent to the menu and then sets the open menu using the Radix Menubar.Root onValueChange api
• Updated vite and tsconfig to add import alias for new /assets directory that contains icons and font from the wireframe.
• Created a new .env variable in vite.config.ts and .env.example VITE_SERVER_ORIGIN so the app knows to fetch assets from the dev server instead of the drupal site.
• Moved layout to be in the layers tab of the new menu.

To be done in a followup(s):

• Close the menu one drags a component from on drag so the menu is not taking up so much space on the canvas
• Style the draggable components so they look draggable
• Other styling/micro-interactions such as being able to also close the third level submenu on click.
• SVG icon optimization
• Search bar functionality
• Test for dragging a component into the canvas
• A11y check