Use Symfony var-dumper component as Boris variable inspector

[damiankloip]

The drush php command currently uses Boris, and the standard ColoredInspector to show variables.

The Symfony var-dumper component has much more going for it. It shows much more information about objects, like property visibility, array counts... The ColoredInspector does not show any protected properties (which is most properties in D8 now) or floats for example. See the screenshots below:

Now:

Array

Action config entity

With PR:

Array

Action config entity

[dawehner]

Best thing!!!!

[LionsAd]

+1 to this change

[weitzman]

1. We use Kint library to do this in devel. It would be nice to standardize on Kint or VarDumper. Kint can do CLI. Has anyone compared them? I'd like to hear more about this before commit.
2. How are you guys using Boris? I'd love a blog post or a tweet about it. I dont think enough people know about it.

[damiankloip]

I tried Kint::dump() at the cli too and from what it looks like (IMO), not as good as VarDumper. It should similar information but in a way less concise way.

Same examples as PR description, but with Kint::dump():

[LionsAd]

I think VarDumper has the better syntax output, too. Kint is way too verbose for quickly seeing what is relevant.

[dawehner]

IMHO the CLI environment has so many more restrictions, (for example you can't collapse stuff).
Given that, I don't think we need consistency in terms of using the same library.

Yes, it would be nice if both libraries would work more together

[weitzman]

OK, I'm fine with this PR. Needs reroll as changes were made to composer.lock.

[wimleers]

AWESOME! :)