[Console] added type hinting for array to setAliases method

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

This patch would improve feedback when passing an invalid alias to setAliases method:

e.g.

`Argument 1 passed to Symfony\Component\Console\Command\Command::setAliases() must be of the type array, string given,` [...]

instead of 
 
`Invalid argument supplied for foreach()`
I thought throwing an exception would break compatibility evenly but well, I'll do as you wish and feel is more appropriate.