feat: add "duration" formatter

[kbond]

I have a requirement to use the Helper::formatDuration() from symfony/console in twig templates. I thought this bundle would be a good place for this.

Copied much of the code from symfony/console and added translations. I'll leave to others to add translations for other locales.

{{ 0|duration }} {# < 1 sec #}
{{ 1|duration }} {# 1 sec #}
{{ 56|duration }} {# 56 secs #}
{{ 60|duration }} {# 1 min #}

Should I update the changelog?

For the docs, we should perhaps re-jig them a bit as it says This bundle does one simple job - not anymore if this PR is merged.

[weaverryan]

Thanks Kevin!