Add structured logging capabilities

[Jan Ehrhardt]

Erlang's Logger module is much more powerful than what this library exposes to Gleam applications. Regarding structured logging, I consider the following as basics for a logging library:

• Passing meta data to log events
• Setting global and process level meta data
• Making the formatter / handler configurable (e.g. pass a custom Gleam function)
• Provide an optional default JSON formatter
• Convenience functions like debug and error that automatically set the level

I would like to provide some pull requests to implement the above. But I would also like to get your opinion on which points make sense to you as well.

[Louis Pilfold]

Hello! This is not in scope for this simple library. You can use one of the other existing logging library which do support this.

[Jan Ehrhardt]

Thanks for clarification.