### Describe the feature <img width="627" alt="1678276058671" src="https://user-images.githubusercontent.com/52746628/223705696-24f7b57c-29e2-41e1-9fde-9020506437c4.png"> I hope to provide a default filter that excludes keys and their corresponding values starting with ":" when importing request headers. ### Environment Postcat V0.3.2 Engine: webkit EngineVs: 537.36 Supporter: chrome SupporterVs: 109.0.0.0 System: windows SystemVs: 10 平台: Web