Wide events loggin support

[mishankov]

Example: https://www.evlog.dev/

[mishankov]

https://loggingsucks.com/

[mishankov]

• Add middleware that would create wide log event and put in context
• Remove default time field from wide event log
  wide-events uses slog under the hood, and the standard time field is added by the handler.
  Drop it with HandlerOptions.ReplaceAttr:

opts := &slog.HandlerOptions{
	Level: level,
	ReplaceAttr: func(_ []string, a slog.Attr) slog.Attr {
		if a.Key == slog.TimeKey {
			return slog.Attr{} // remove default slog "time"
		}
		return a
	},
}

Then use opts in both handlers:

slog.NewJSONHandler(w, opts)
slog.NewTextHandler(w, opts)

• Move trace id middleware to log package
• Merge wide event logging to log package