Add .pipe(file, arguments, options) shortcut

[ehmicky]

Instead of passing a child process to .pipe():

await execa('npm', ['run', 'path'])
  .pipe(execa('sort'))
  .pipe(execa('head', ['-n', '2']))

A template string can be passed to pipe as a shortcut when using $:

await $`npm run path`
  .pipe`sort`
  .pipe`head -n 2`

It would be nice to have that kind of shortcut when not using $ as well, like:

await execa('npm', ['run', 'path'])
  .pipe('sort')
  .pipe('head', ['-n', '2'])

This is a simpler syntax that works for most use cases. The only time this does not work is when the child process is used outside of the pipe, e.g. when childProcess.kill() is used or when piping multiple processes to the same process. But those are not the normal use case.

For everyone else, avoiding the double ((...)) parenthesis and repetition of execa() is more straightforward. It is also easy to remember since the arguments are identical to the execa() call.