[Console] Added the possibility to set a different default command
feature #9776 [Console] Added the possibility to set a different default command (danielcsgomes)

This PR was squashed before being merged into the 2.5-dev branch (closes #9776).

Discussion
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[Console] Added the possibility to set a different default command

I am not quite sure if this is the best approach to solve the issue but the solution I provide works. Let me know your suggestions to improve it.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8058
| License       | MIT
| Doc PR       | symfony/symfony-docs#3426

Commits
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418de05 [Console] Added the possibility to set a different default command