Support XTerm Alternate Scroll Mode escape sequences

Summary:
This mimics the XTerm Alternate Scroll Mode 1007

The h (set), l (reset), s (save), r (restore) modes depend on the profile
setting Mouse->Enable Alternate Screen buffer scrolling.

Depends on D12139

Reviewers: Konsole, hindenburg

Reviewed By: Konsole, hindenburg

Subscribers: Konsole

Tags: Konsole

Differential Revision: https://phabricator.kde.org/D12140