addition: EnumCase::except provider

[remipelhate]

Prior to this PR, when wanting to exclude some options from the EnumCase provider, we has to do something like:

public static function enumCases(): iterable
{
    $exclude = [SomeEnum::First, SomeEnum::Last];

    yield from EnumCase::options(...array_filter(
        SomeEnum::cases(), 
        fn (SomeEnum $case): bool => ! in_array($case, $exclude),
    ));
}

Not only is it cumbersome to write, it's pretty hard to read as well.

This PR simplifies it with a new provider constructor:

public static function enumCases(): iterable
{
    yield from EnumCase::except(SomeEnum::class, SomeEnum::First, SomeEnum::Last);
}

[ppelgrims]

Much better!