Allow to define shell command by name and list of argument strings

[alexeymuranov]

I am reluctant to adopt any build tool where the only way to define a shell command is by full command line given as a string.

Normally, I know the name of the command, I know the arguments with which it has to be run, and I do not want to think about how to concatenate it all into a single string, properly quoted and escaped, just so that it could be parsed back correctly.

I looked through the documentation of Please, but did not find how to directly execute a shell command if I know it's name and arguments.

For comparison, Python has subprocess.run, Rake and Ruby have sh, Buck2 has ctx.actions.run and cmd_args.

An idea of adding something similar to Please was mentioned in #2863 (comment), if I have understood it correctly.