Add Person's external identifiers to creation and edit form

src/Bundle/ChillPersonBundle/PersonIdentifier/PersonIdentifierEngineInterface.php

@@ -19,9 +19,29 @@ interface PersonIdentifierEngineInterface
 {
     public static function getName(): string;
 
+    /**
+     * @phpstan-pure
+     */
     public function canonicalizeValue(array $value, PersonIdentifierDefinition $definition): ?string;
 
     public function buildForm(FormBuilderInterface $builder, PersonIdentifierDefinition $personIdentifierDefinition): void;
 
     public function renderAsString(?PersonIdentifier $identifier, PersonIdentifierDefinition $definition): string;
+
+    /**
+     * Return true if the identifier must be considered as empty.
+     *
+     * This is in use when the identifier is validated and must be required. If the identifier is empty and is required
+     * by the definition, the validation will fails.
+     */
+    public function isEmpty(PersonIdentifier $identifier): bool;
+
+    /**
+     * Return a list of @see{IdentifierViolationDTO} to generatie violation errors.
+     *
+     * @return list<IdentifierViolationDTO>
+     */
+    public function validate(PersonIdentifier $identifier, PersonIdentifierDefinition $definition): array;
+
+    public function getDefaultValue(PersonIdentifierDefinition $definition): array;
 }