feat(signal-slice): add effects config

[joshuamorony]

This adds an effects config to signalSlice. It uses the standard signal effect internally, this just allows you to define your effects within the signalSlice definition rather than having to define them separately in a constructor or field initialiser:

state = signalSlice({
	initialState: this.initialState,
	sources: [this.sources$],
	reducers: {
		add: (state, checklist: AddChecklist) => ({
			checklists: [...state.checklists, this.addIdToChecklist(checklist)],
		}),
	},
	effects: (state) => ({
		init: () => {
			console.log('hello');
		},
		saveChecklists: () => {
			// side effect to save checklists
			console.log(state.checklists());
		},
	}),
});

Note that I have added but disabled tests for this feature pending the ability to use flushEffects

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