Closes #25421

This PR adds support for external file managers to show Zed as an option
in the "Open With" context menu for directories on macOS.

<img width="350" alt="image"
src="https://github.com/user-attachments/assets/c52acd48-73c4-47be-8683-6950e0371b73"
/>


Release Notes:

- Added support for opening folders in Zed from third-party macOS file
managers like Path Finder and Super Charge through their "Open With"
menu.