Investigate ways to notify users that an extension dependency was automatically installed

Or in other words: why was this automatically installed now? Perhaps Pylance requested it, or needs it? Providing a reason why specifically this extension is installed automatically will help acceptance.

My extension list:
```
GitHub.vscode-pull-request-github
josetr.cmake-language-support-vscode
marus25.cortex-debug
ms-dotnettools.vscode-dotnet-runtime
ms-python.python
ms-python.vscode-pylance
ms-toolsai.jupyter
ms-toolsai.jupyter-keymap
ms-toolsai.jupyter-renderers
ms-vscode-remote.remote-ssh
ms-vscode-remote.remote-ssh-edit
ms-vscode-remote.remote-wsl
ms-vscode.cmake-tools
ms-vscode.cpptools
ms-vscode.hexeditor
twxs.cmake
VisualStudioExptTeam.vscodeintellicode
```

About VS Code:
```
Version: 1.68.0 (Universal)
Commit: 4af164ea3a06f701fe3e89a2bcbb421d2026b68f
Date: 2022-06-08T11:44:00.250Z (5 days ago)
Electron: 17.4.7
Chromium: 98.0.4758.141
Node.js: 16.13.0
V8: 9.8.177.13-electron.0
OS: Darwin arm64 21.5.0
```