Support Angular Signals

[patdx]

When Angular 16 comes out, it may be interesting to support.

[patdx]

In the meantime it should be relatively easy to use:

import { toSignal } from '@angular/core/rxjs-interop';

While I don't want this library to be tied to Angular, I imagine it could be useful for people using Angular.

If this library supported this directly, I think I would add Angular as an optional peerDependency and have a separate import entry point, eg:

import { toSignal } from 'zustand-rx/angular';

This entrypoint should also NOT use rxjs as well, to allow bundle size savings for people who just want Angular signals without importing RxJS.