Prevent validators from generating validatorBuilder Ids

When calling `v::validatorName()`, a `ValidatorBuilder` is instantiated
to manage the validation chain. However, users generally expect the ID
to reflect the specific validator invoked rather than the internal
builder class.

This commit updates `Id::fromValidator()` to resolve the ID from the
underlying validator when it is the sole member of the
`ValidatorBuilder`, ensuring more intuitive identification.

Author: henriquemoody

library/Id.php

@@ -9,6 +9,7 @@
 
 namespace Respect\Validation;
 
+use function count;
 use function lcfirst;
 use function strrchr;
 use function substr;
@@ -23,6 +24,10 @@ public function __construct(
 
     public static function fromValidator(Validator $validator): self
     {
+        if ($validator instanceof ValidatorBuilder && count($validator->getValidators()) === 1) {
+            return self::fromValidator($validator->getValidators()[0]);
+        }
+
         return new self(lcfirst(substr((string) strrchr($validator::class, '\\'), 1)));
     }