[10.x] Add list rule

[medilies]

When I want my API to receive a JSON array, the current array rule allows both JSON arrays and JSON objects. With this list rule, I can be sure I will receive [1, 2, 3] instead of {"a": 1, "b": 2, "c": 3}.

[medilies]

I forgot to this 'list' => 'The :attribute field must be a list.', to src\Illuminate\Translation\lang\en\validation.php and I'm a afraid a new commit from me will rerun the actions.

[fragkp]

I forgot to this 'list' => 'The :attribute field must be a list.', to src\Illuminate\Translation\lang\en\validation.php and I'm a afraid a new commit from me will rerun the actions.

It will trigger a rerun, but thats totally fine.

[diegogit03]

Maybe this rule can receive a datatype something like list:number or list:string

[medilies]

That's a good point @diegogit03 but I didn't try to handle that in this rule because the developer can use something like ['field' => 'list', 'field.*' => 'number'].

[taylorotwell]

Can you send to 11.x branch?