Added option to show controllers optionally in the router:debug command
merged branch peterrehm/router-command (PR #8657)

This PR was squashed before being merged into the master branch (closes #8657).

Discussion
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Added option to show controllers optionally in the router:debug command

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

Added option to show controllers in the router debug command as a convenience function.

    app/console router:debug --show-controllers

Commits
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6fd32f3 Added option to show controllers optionally in the router:debug command