refactor(module/loadbalancer): separate fip and rules

[FoSix]

An example how separation of FIPs and rules would look like

[sebastianczech]

For me it's cleaner approach, we don't have so much locals, validations can be splited into separated variables etc. :)

[acelebanski]

Hey Łukasz, are you still planning to prepare more complex examples to compare old vs new way of doing things?