Missing IsTerminal::is_terminal for files and stdin

[ventaquil]

Is your feature request related to a problem? Please describe.

As far as I see (correct me if I'm wrong) I don't see any IsTerminal::is_terminal alternative known from std lib.

None of tokio::fs::File nor tokio::io::Stdin doesn't have any IsTerminal implementation.

Are there plans to change it soon?

Describe the solution you'd like

I am not familiar with async world but maybe those structs should just impl std::io::IsTerminal?

[maminrayej]

tokio::fs::File is supposed to be used with real files since it assumes you have to use blocking IO to interact with the file which may not be true for files representing a terminal. But, I believe it makes sense to implement IsTerminal for stdin/stdout/stderr. Still, we need an MSRV bump to make progress on this.