feat(query-params): add an option to use brackets convention with arrays

[qboot]

Hello 👋

Currently the generated API encode query params arrays like: ?a=foo&a=bar&a=baz with the repeat convention.
But all the backends don't follow this convention, and some use the brackets one: ?a[]=foo&a[]=bar&a[]=baz.

So, this PR adds a new option --query-params-with-brackets which allow the use of the brackets convention instead of the repeat (only applicable when the query param is an array).

[qboot]

@js2me can you elaborate on why this PR has been closed? Thx!