Refactor kafka to pure Go (franz-go), fix DBC stubs, update Dockerfile

pkg/can-go/internal/clock/system.go

@@ -0,0 +1,34 @@
+package clock
+
+import (
+	"time"
+)
+
+// System returns a Clock implementation that delegate to the time package.
+func System() Clock {
+	return &systemClock{}
+}
+
+type systemClock struct{}
+
+var _ Clock = &systemClock{}
+
+func (c systemClock) After(d time.Duration) <-chan time.Time {
+	return time.After(d)
+}
+
+func (c systemClock) NewTicker(d time.Duration) Ticker {
+	return &systemTicker{Ticker: *time.NewTicker(d)}
+}
+
+func (c systemClock) Now() time.Time {
+	return time.Now()
+}
+
+type systemTicker struct {
+	time.Ticker
+}
+
+func (t systemTicker) C() <-chan time.Time {
+	return t.Ticker.C
+}