[Console] Add completion for fish

[stof]

Bash completion was implemented in #42251

It would be great to have support for fish as well.

[dkarlovi]

fish support should have fish equivalents:

• this template file: https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Console/Resources/completion.bash
• this output class: https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Console/Completion/Output/BashCompletionOutput.php

[guillaume-a]

Fish custom completion doc