feat(options): optionally allow custom logger to be provided

[iainsproat]

In many environments logging to console is not recommended, and instead a different logging mechanism is used. This may be to provide metadata, or to ensure the logged message conforms to a particular format (e.g. json), etc..

This Pull Request allows a different logging mechanism to optionally be provided. The logging mechanism must conform to the existing interface expected of console; e.g. it must provide an error, warn, and log method.

Defaults to console, which is the existing behaviour.

[rajithavk]

Why isn't this merged yet?

[Necrelox]

Exactly what was missing in ioredis, the ability to have a custom logger.

Please, I hope you can merge this quickly, it's been several months already 😅

It's exactly what I need right now.