feat(signal-slice): allow supplying external subjects as reducers

[joshuamorony]

This deals with situations where you need your sources to react to actions. These actions need to be defined as external subjects as the sources can not reference the internally created actions:

const trigger$ = new Subject<void>();
const state = signalSlice({
  initialState,
  sources: [trigger$.pipe(map(() => ({ age: testAge })))],
  reducers: {
    trigger: trigger$,
  },
});

state.trigger();

Allowing the subject to be supplied as a reducer means you can still access all of your actions on the state object, e.g:

state.trigger();

instead of needing to trigger some actions via the external subject:

trigger$.next();

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