Support creating users with a password

[mkg20001]

This allows for creating users with a password by setting the "password" attribute if "Change Password Supported" is true, similar to how updateResource handles it

[Captain-P-Goldfish]

Please provide an additional unit test to prevent future regressions. There is already an existing unit test that you can use as template:

@Slf4j
public class UserHandlerTest extends AbstractScimEndpointTest
{

  /**
   * verifies that the user password can be updated if support is enabled
   */
  @Test
  public void testUpdatePassword()
...

[mkg20001]

Done