Support different stores configuration with different identity types

Currently, we're supporting multiple stores configuration. But they can not mix/support different identity types.

We also need to consider multiple store configurations with different identity types, as follows:

builder
    .named("default")
        .stores()
            .jpa()
                .supportType(Role.class, Partition.class)           
            .ldap()
                .supportType(LdapUser.class, Group.class)

The example above, allows to store the LdapUser and Group identity types using the LDAP store and JPA for Role.