Operator timeout should forward callback errors

[vitaly-t]

Currently, if you throw an error while handling callback of operator timeout, it is not handled. It should be caught and passed on down the chain.

Why it matters: you may want to handle a callback, and turn it into an error that will be handled in a generic way, via catchError.

It can be considered both a bug (more likely) and an enhancement.

NOTE: This issue primarily affects the async version of the operator.

[vitaly-t]

The fix was implemented in v3.0.5, which makes the following possible:

const i = pipeAsync([1, 2, 3], delay(10), timeout(1, () => {
    throw new Error('timeout');
}))
.catch(err => {
    console.log(err); //=> Error: "timeout"
});

i.e. if you throw an error inside timeout callback, it previously would not be handled correctly, but now it is.