Append pool_type and pool_mgr info to logs

Pool managers will have 2 fields identifying which manager generated
the log line.

In the future, we will add tracking ids in various cases, allowing
us to track down issues faster.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

util/logging.go

@@ -0,0 +1,30 @@
+package util
+
+import (
+	"context"
+	"log/slog"
+)
+
+type slogContextKey string
+
+const (
+	slogCtxFields slogContextKey = "slog_ctx_fields"
+)
+
+type ContextHandler struct {
+	slog.Handler
+}
+
+func (h ContextHandler) Handle(ctx context.Context, r slog.Record) error {
+	attrs, ok := ctx.Value(slogCtxFields).([]slog.Attr)
+	if ok {
+		for _, v := range attrs {
+			r.AddAttrs(v)
+		}
+	}
+	return h.Handler.Handle(ctx, r)
+}
+
+func WithContext(ctx context.Context, attrs ...slog.Attr) context.Context {
+	return context.WithValue(ctx, slogCtxFields, attrs)
+}