Create registerPreStateInit hook

[Alexander]

Discussed in #381

^{Originally posted by ivalexandr November 19, 2022}
Hello. Why does the documentaion say that state in Elf is immutable? After all, we can change it without calling update method.
Can we change this behavior and somehow protect from mutations the object obtained from the store?

[Netanel Basal]

Add a new registerPreStoreInit hook that takes the provided initial state and returns it.

import { elfHooks, deepFreeze } from '@ngneat/elf';

if (!environment.production) {
  elfHooks.registerPreStateInit((initialState, storeName) => {
    return deepFreeze(initialState);
  });
}

[Netanel Basal]

@ivalexandr, you're welcome to create a PR. It should be straightforward.