fix: made password field as optional field

Author: Barbara Palumbo

src/Core/Model/Customer/Customer.php

@@ -102,7 +102,7 @@ public function fieldDefinitions()
             'email' => [static::TYPE => 'string'],
             'firstName' => [static::TYPE => 'string', static::OPTIONAL => true],
             'lastName' => [static::TYPE => 'string', static::OPTIONAL => true],
-            'password' => [static::TYPE => 'string'],
+            'password' => [static::TYPE => 'string', static::OPTIONAL => true],
             'middleName' => [static::TYPE => 'string', static::OPTIONAL => true],
             'title' => [static::TYPE => 'string', static::OPTIONAL => true],
             'dateOfBirth' => [

src/Core/Model/Customer/CustomerDraft.php

@@ -87,7 +87,7 @@ public function fieldDefinitions()
             'firstName' => [static::TYPE => 'string', static::OPTIONAL => true],
             'middleName' => [static::TYPE => 'string', static::OPTIONAL => true],
             'lastName' => [static::TYPE => 'string', static::OPTIONAL => true],
-            'password' => [static::TYPE => 'string'],
+            'password' => [static::TYPE => 'string', static::OPTIONAL => true],
             'anonymousCartId' => [static::TYPE => 'string', static::OPTIONAL => true],
             'externalId' => [static::TYPE => 'string', static::OPTIONAL => true],
             'dateOfBirth' => [