[DependencyInjection] Add env() and EnvConfigurator in the PHP-DSL

[nicolas-grekas]

Q	A
Feature PR	symfony/symfony#40682
PR author(s)	@fancyweb
Merged in	5.3-dev

[carsonbot]

Thank you for this issue.
There has not been a lot of activity here for a while. Has this been resolved?

[carsonbot]

Friendly reminder that this issue exists. If I don't hear anything I'll close this.

[carsonbot]

Hey,

I didn't hear anything so I'm going to close it. Feel free to comment if this is still relevant, I can always reopen!

[HeahDude]

Can we reopen here? I may deal with this one

[javiereguiluz]

Let's reopen. Thanks Jules!

[HeahDude]

See #16803.