can we rename `outputStream` to `destination` to match pino v5 parlance

[davidmarkclements]

Due to the addition of pino.destination, and that fact SonicBoom kind of is and kind of isn't a stream, the adoption of the term "destination" has become prevalent in the v5 documentation.

For parity with pino, in the next-major branch, are there any arguments against renaming outputStream option to destination.

[davidmarkclements]

oh hold on a second it looks like the outputStream default option isn't used at all

@jsumners can you clarify?

[mcollina]

+1 on using destination.

[jsumners]

Best guess is it's a vestige of the original implementation.