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/sink.go

@@ -0,0 +1,10 @@
+package audit
+
+import "context"
+
+// Sink processes audit events. Implementations decide which event types they
+// care about. Handle must not block the caller for I/O-heavy operations.
+type Sink interface {
+	Handle(ctx context.Context, event AuditEvent) error
+	Close() error
+}