Add Finder actions to open VS Code or terminal window here

Ghostty has `New Ghostty Tab Here` and `New Ghostty Window Here` in Finder and I found these pretty useful.

They are macOS Services declared in [Ghostty-Info.plist](https://github.com/ghostty-org/ghostty/blob/e77b2309fca3a27db1123a4f904b7fb432ee7162/macos/Ghostty-Info.plist#L66-L106) and handled by [ServiceProvider.swift](https://github.com/ghostty-org/ghostty/blob/e77b2309fca3a27db1123a4f904b7fb432ee7162/macos/Sources/Features/Services/ServiceProvider.swift#L13-L74). The handler uses the selected folder as the cwd, or the selected file's parent folder, deduplicates paths, and opens one tab/window for each cwd.

VS Code could consider doing something similar on macOS:

- `New VS Code Window Here`
- `New VS Code Terminal Here`

The first would be similar to `code --new-window `. The second could open the existing dedicated terminal window (`Terminal: New Terminal Window`) with the selected directory as its cwd.

For files, use the parent folder; for folders, use the folder itself. Multiple selections could be deduplicated, matching Ghostty.