Expose newDefaultLogger function

[hgiasac]

Description

We may want to use the default logger with a custom slog.Logger, for example, add custom attributes or format. Copying the default logger's code is redundant in those use cases.

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[maypok86]

Hi, sorry for the delayed reply, I've been extremely busy this past week.

It looks good, but I don't like the name NewDefaultLogger. It seems more like just a wrapper over the slog logger. Usually, this is done through something like a plugin system, at the very least, users of zap and zerolog might want the same thing. For example, franz-go.

I'll take a closer look on Saturday.