Automate languages that require repl input to run code

[raxod502]

Some languages, like https://riju.codes/yorick, require some manual input to run the code. This is because we want to run the code in the context of a repl when possible, and some languages don't provide an option to do this, and require the user to do it manually. This is bad UX.

Now that we've reimplemented the pty interface, we could probably support supplying some data on stdin at repl launch and then accepting further input from the user. This would probably take the form of invoking riju-pty in some languages' run commands.