feat: Add audit system with sink based dispatcher (#211)

* chore: Dependency update

* feat: Add audit system with eventlog as a sink

* fix: Linter fixes

* fix: Code review fixes

internal/audit/eventlog_sink.go

@@ -0,0 +1,59 @@
+package audit
+
+import (
+	"context"
+
+	"github.com/safedep/pmg/internal/eventlog"
+)
+
+type eventlogSink struct{}
+
+func newEventlogSink() *eventlogSink {
+	return &eventlogSink{}
+}
+
+func (s *eventlogSink) Handle(_ context.Context, event AuditEvent) error {
+	elEvent := eventlog.Event{
+		Timestamp:   event.Timestamp,
+		EventType:   mapEventType(event.Type),
+		Message:     event.Message,
+		PackageName: pkgName(event.PackageVersion),
+		Version:     pkgVersion(event.PackageVersion),
+		Ecosystem:   pkgEcosystem(event.PackageVersion),
+		Details:     event.Details,
+	}
+	return eventlog.LogEvent(elEvent)
+}
+
+func (s *eventlogSink) Close() error {
+	return nil
+}
+
+func mapEventType(t EventType) eventlog.EventType {
+	switch t {
+	case EventTypeMalwareBlocked:
+		return eventlog.EventTypeMalwareBlocked
+	case EventTypeMalwareConfirmed:
+		return eventlog.EventTypeMalwareConfirmed
+	case EventTypeInstallAllowed:
+		return eventlog.EventTypeInstallAllowed
+	case EventTypeInstallTrustedAllowed:
+		return eventlog.EventTypeInstallTrustedAllowed
+	case EventTypeInstallStarted:
+		return eventlog.EventTypeInstallStarted
+	case EventTypeDependencyResolved:
+		return eventlog.EventTypeDependencyResolved
+	case EventTypeInstallInsecureBypass:
+		return eventlog.EventTypeInstallInsecureBypass
+	case EventTypeProxyHostObserved:
+		return eventlog.EventTypeProxyHostObserved
+	case EventTypeSandboxOverride:
+		return eventlog.EventTypeSandboxOverride
+	case EventTypeError:
+		return eventlog.EventTypeError
+	case EventTypeSessionComplete:
+		return eventlog.EventType("session_complete")
+	default:
+		return eventlog.EventType(string(t))
+	}
+}