Feature Request: API: Subscribe to the "data" event on a terminal

[KalitaAlexey]

Hi everybody,

I suggest to add a new function on to the class Terminal.

Motivation

There is an extension for Rust RustyCode.
There is a command build.
When build is finished, we parse output and show warnings, errors and etc. in user's code.
Currently it is made via the class OutputChannel, which doesn't support input.

Example

let terminal = vscode.window.createTerminal('Build');
terminal.on('data', data => {
    let buildProgress = this.parseBuildProgress(data);
    this.updateBuildProgress(buildProgress);
});
terminal.show();
terminal.sendText('make');

Alternatives

Write to a file

let terminal = vscode.window.createTerminal('Build');
terminal.show();
terminal.sendText('make |& tee /tmp/some_file');

I will implement it myself.
I am opening this issue to receive opinions.

Regards,
Alexey

[Tyriar]

Closing this off as a duplicate of #13337, not quite ready to accept a PR for this yet but the terminal API is one of the areas I'll be looking at in January. We have a similar need though as we want the tasks framework to use the terminal instead of output #15584