editor: Add SelectPageUp/SelectPageDown actions (#13272)

This adds two new actions to `editor`:

- `editor::SelectPageUp`
- `editor::SelectPageDown`

On Linux they're bound by default to `shift-pageup` and
`shift-pagedown`, which matches VS Code and JetBrains.

Release Notes:

- N/A
3d4f275c52Thorsten Ball committed on 6/19/2024, 3:37:17 PM· committed by GitHubparentcd2533d
5 files changedLine totals unavailable