[gp-cli] allow to extend timeout

[akosyakov]

Gitpod CLI should have a new command timeout extend which will boost a workspace timeout.

To extend a timeout we should use Gitpod Server APIs similarly how it is done in VS Code extension.

[stale]

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.

[loujaybee]

We should wait for: #9038 before investigating this 🙏