Proposal for `log4cats-sourcecode` module to provide information about the call site

I suggest adding a module for integration with sourcecode to add information about the call site to the context of a structured logger. Rather than introduce a new subtype of Logger, I think the simplest thing is to put the logging methods on an object. It might look something like this:

object SourceCodeLogger {
  def info[F[_]](ctx: Map[String, String])(msg: => String)(implicit logger: StructuredLogger, line: sourcecode.Line, file: sourcecode.File): F[Unit] =
    logger.info(ctx ++ Map("callsite" -> s"${file.value}:${line.value}"))(msg)
  /* ... */
}

Of course there's endless scope for bike shedding about exactly what information should be provided and in what format, so I don't know if this is over-opinionated to go in a library like log4cats?

Start by reviewing the proposed log4cats-sourcecode module and the StructuredLogger API, then inspect the linked sourcecode integration. The scope is not settled: completion would require an agreed API and format for adding call-site information to structured-logger context.