[9.x] Add ExcludeIf and ProhibitedIf Validation Methods

[intrepidws]

Much like the existing Rule::requiredIf() method allows for more complex conditions, I am proposing the addition of Rule::excludeIf() and Rule::prohibitedIf()methods. These work in much the same way and will allow for more complex conditions. Examples below.

use Illuminate\Support\Facades\Validator;
use Illuminate\Validation\Rule;
 
Validator::make($request->all(), [
    'role_id' => Rule::prohibitedIf($request->user()->is_expired),
]);
 
Validator::make($request->all(), [
    'role_id' => Rule::prohibitedIf(fn () => $request->user()->is_expired),
]);

Validator::make($request->all(), [
    'role_id' => Rule::excludeIf($request->user()->is_expired),
]);
 
Validator::make($request->all(), [
    'role_id' => Rule::excludeIf(fn () => $request->user()->is_expired),
]);