Implement a function resumableInterval(callback, delay) that creates an interval which can be paused and resumed.

The returned object should have methods:

• start(): starts or resumes the interval.
• pause(): pauses the interval.
• stop(): stops the interval completely.

The interval should repeatedly invoke the callback every delay milliseconds while running.

Example

const interval = resumableInterval(() => console.log('tick'), 1000);

interval.start(); // starts logging 'tick' every 1s
setTimeout(() => interval.pause(), 3500); // pauses after ~3 ticks
setTimeout(() => interval.start(), 5000); // resumes interval
setTimeout(() => interval.stop(), 9000); // stops interval