Suggestion: explicitEffect - allow non-array signal parameter

[mmorgan4x]

allow explicitEffect to accept a non-array signal parameter

const count = signal(0);
explicitEffect(count, t => {  console.log(`count updated ${t}`) });

instead of

const count = signal(0);
explicitEffect([count], ([t]) => {  console.log(`count updated ${t}`) });

[eneajaho]

@JeanMeche should we add this? This came up during initial exploration phase btw, but we decided against it.