[Feature] Add combobox

[ilyabayel]

Hello,

With the Command component now added, we can move forward with documenting the Combobox implementation.

The goal is to recreate all the demos provided in Shadcn UI and make necessary adjustments if anything isn't working as expected. Since the Combobox isn't a standalone component but more of a guide for using existing primitives, we won't need to create a separate component for it.

Reference: Shadcn UI Combobox Documentation