Downloading files and folders should preserve executable bit

[ItalyPaleAle]

Describe the bug
When you download a file from a remote (e.g. Codespaces), attributes such as the executable bit are removed. This is a (somewhat minor) annoyance when you are downloading files such as compiled binaries.

To Reproduce
Steps to reproduce the behavior with Codespaces:

1. Within a codespace, create a file that has the executable bit set (e.g. touch foo && chmod +x foo).
2. CMD+Click on the file and download it to your laptop
3. The file will not have the executable bit locally so you need to run chmod +x foo again

Expected behavior
The executable bit should be preserved when downloading files.

https://github.com/microsoft/vssaas-planning/issues/1639

[isidorn]

Code pointer

vscode/src/vs/workbench/contrib/files/browser/fileActions.ts

Line 1130 in 5e5ae15

operation.filesDownloaded++;

fyi @bpasero since I believe you wrote the original download code and you might have ideas.
If not I can do some investagion...

[bpasero]

@isidorn this is not possible to implement with todays file system provider API. We would need to add group/permission/executable information to file system providers (@jrieken), otherwise we cannot restore this.

Some related issues: #48659, #71204