Added TwigStringColumn for simple inline templating

[freezy-sk]

This column introduces simple inline templating when you don't want to use TextColumn or don't want to create template files consisting of one line of code

->add('link', TwigStringColumn::class, [
    'template' => '<a href="{{ url(\'employee.edit\', {id: row.id}) }}">{{ row.firstName }} {{ row.lastName }}</a>',
])

[curry684]

I like it. Could you add a snippet to the docs as well?

[curry684]

@freezy-sk I'll merge this and tag a new version when it's conflict-free and has a doc snippet 👼

[freezy-sk]

@curry684 docs added and PR rebased on latest master

[curry684]

Awesome, thanks!