Auto-configure an ObjectDirectoryMapper bean and configure LdapTemplate to use it

[jzheaux]

Related to spring-projects/spring-ldap#633, it would be nice if Spring Boot picked up a ObjectDirectoryMapper bean:

@Bean
@ConditionalOnMissingBean(LdapOperations.class)
public LdapTemplate ldapTemplate(LdapProperties properties, ContextSource contextSource, 
        ObjectDirectoryMapper objectDirectoryMapper) {
        // ...
	LdapTemplate ldapTemplate = new LdapTemplate(contextSource);
	ldapTemplate.setObjectDirectoryMapper(objectDirectoryMapper);
	return ldapTemplate;
}

As of Spring LDAP 3.3.0-M2, Spring Boot can import ObjectDirectoryMapperConfiguration to publish a ObjectDirectoryMapper bean.

[wilkinsona]

Thanks, @jzheaux. Unfortunately, I'm not sure that we can use ObjectDirectoryMapperConfiguration in Boot as the use of @Fallback will mean that it doesn't quite behave as users might expect. When it backs off due to a user-defined ObjectDirectoryMapper, that information won't be available in the condition evaluation report. I think the converter registration may also require a different approach so that it works consistently in a Boot app as it seems to be sensitive to the conversion service's name at the moment.

[wilkinsona]

Closing in favour of #44290.