feat: implement uname and which as builtin functions

[wolfv]

Seems to work quite well. Let me know what you think @certik / @prsabahrami :)

[certik]

I think we should remove the codecov/patch, since it always fails. I like the CI to be green. :)

[certik]

I tested on Windows, both which and uname works:

~/repos/shell(uname-which)$ which git
C:\Program Files\Git\cmd\git.exe
~/repos/shell(uname-which)$ uname -a
Windows_NT LAPTOP-XYE11GAT 10.0 22631 x86_64 MS/Windows (Windows 11)

[wolfv]

Should we merge then?! :)

[certik]

Go for it!

[wolfv]

I think I should remove a few unwrap's to make things nice.

[prsabahrami]

I think it's great. Though, as you mentioned, I think it's better to replace the unwraps with proper error handling. =)

[prsabahrami]

Also, @wolfv do you think you could add some tests? It would be great to start implementing tests for the newer features so they won't get stacked up altogether.

[wolfv]

Already in thanks to @prsabahrami in #135