[10.x] Add Enum Support to the In and NotIn Validation Rules

[geisi]

Greetings Laravel Team,

This pull request introduces enhanced support for Enum types within the In and NotIn validation rules.

Motivation:

In many scenarios, developers might want to validate an input against a specific subset of enum values. Unfortunately, the current Laravel validation rules for In and NotIn do not natively support this functionality.

Changes Introduced:

With this PR, the validation against enum values can be seamlessly performed using the provided syntax:

enum Color: string
{
   case RED = 'red';
   case GREEN = 'green';
   case BLUE = 'blue';
}

Validator::validate(['color'=>'green'], ['color'=> [Rule::in([Color::RED, Color::GREEN])]]);

Looking forward to your feedback and hoping for a positive consideration.

[hafezdivandari]

Although I think it's a better approach to make existing rules more functional and flexible than introducing new ones, but this is recently tried on #47630 and closed due to exsitance of new enum rule.

[geisi]

Thank you for pointing out the recent attempt in #47630. While there is indeed an existing Enum rule, enhancing the In rules offers functionality that the current Enum Rule doesn't provide. Please refer to my example for clarity.

[MarekVikartovsky]

at least this feature was approved :)