This PR implements linux file dialogs and open/reveal actions.

| Open folder | Reveal path |
| --- | --- |
| ![Screenshot from 2024-02-15
16-50-49](https://github.com/zed-industries/zed/assets/1423607/b4260574-d841-4ded-821d-521f507916d1)
| ![Screenshot from 2024-02-15
16-51-36](https://github.com/zed-industries/zed/assets/1423607/1f32f451-7def-423a-9d69-de2876285b60)
|

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>