[Feature Request] /clear command should fully clear log history without showing /clear entry

Question

**Bug Description**
When /clear is run it still leaves the log for /clear, i.e. /clear and (no content). I think it should fully clear similar to what zsh / bash does, not showing that log.

**Environment Info**
- Platform: darwin
- Terminal: vscode
- Version: 2.1.119
- Feedback ID: 9a81d3e6-f81d-44dd-9c1a-b9cf9a6163b0

**Errors**
```json
[]
```