Integrate FidryConsole

[theofidry]

While working mostly CLI centric applications (Box, PHP-Scoper, Infection), I have always been frustrated with a couple of points regarding symfony/console.

After years of trying to ignore this, it finally reached the tipping point and I decided to write fidry/console.

The initial promise is:

• Make the API more transparent: there is clear, documented interfaces. No more extending a 600-1200 LoC base class with sometimes hard to find hooks
• A typed API: the input arguments and options can be accessed via a rich typed API which goes beyond providing a type information, but also does check if the type coercion makes sense. A concrete example, you want a natural argument. At the end of the day the input is a user-based input so anything (physically possible) can be given. For an argument it is null|string|list<string>. With the typed API, you can easily coerce it to a natural value (PHPStan/Psalm compatible) whilst failing gracefully, providing a helpful message to the user when the input is incorrect.
• A few utilities (IO object, CommandTester, ApplicationTester) to make your life easier.

I designed the library with goal to merge it back to Symfony eventually and I'm working with @chalasr for that, but that will realistically take a while. As a result though, the library can be seen as a very thing layer on top of the Symfony console as opposed to competing with it.

Anyway, the library has now been merged both in Box (see box-project/box#646) and PHP-Scoper (humbug/php-scoper#480 – earlier version and less clean probably in terms of PR). I'll be happy to do a PR for Infection as well if you are interested.