feat: enable users to pass a custom logger

[jeswr]

This PR adds the feature of allowing users to pass a custom Logger to bashlib functions.

[jeswr]

@Dexagod could you please review this when you get the chance (I lack the permissions to add you as a reviewer)

[mielvds]

Thanks, looks good! Not a result of this PR, but I wonder whether we still need both the writeErrorString methods and the (logger || console).error constructs. It would be cleaner to use one method.

[Dexagod]

I know I've been a tad inconsistent as well with my logging.
I'll take a look at making it a bit more consistent over the whole codebase.

[jeswr]

I'll take a look at making it a bit more consistent over the whole codebase.

@Dexagod - just a point to consider is that I am using this to throw an error when logger.error is called.

[jeswr]

Thanks for merging this so fast btw; a release when you get the chance would be very useful :)

[Dexagod]

I've updated the npm package so it should be usable with a global install from the CLI already.
A full release however will require at least a partial test coverage, and fixing session refresh.
Not sure when I'll get to that sadly :/