Fixed #9020 - Added support for collections in service#parameters
bug #9589 [DependencyInjection] Fixed #9020 - Added support for collections in service#parameters (lavoiesl)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9589).

Discussion
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[DependencyInjection] Fixed #9020 - Added support for collections in service#parameters

Disclaimer: I made sure that tests are passing, but I am not sure how to test if it really works. By looking at the code, it should.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9020
| License       | MIT
| Doc PR        | needed

Commits
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462532e [DependencyInjection] Fixed #9020 - Added support for collections in service#parameters