[FEATURE] implement quickpick separators

[hacke2]

如果你的需求与问题相关，请在下面描述一下（Is your feature request related to a problem? Please describe.）

see https://github.com/microsoft/vscode/issues/141193

描述你预期的功能表现（Describe the solution you'd like）

描述你考虑过的替代方案（Describe alternatives you've considered）

补充信息（Additional context）

[hacke2]

ts 1.63 依赖

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.