Support page down / up keypresses for interactive `--resume` session picker

### Describe the feature or problem you'd like to solve

When resuming a past session, it can be extremely slow solely using arrow keys to find the right session. If the session picker supported page up / down keypresses, then it would be a bit faster to find the right session to resume.

### Proposed solution

Proposed solution is allowing page up / down keypresses to skip pages when scrolling. This would make it easier getting back to past work, reducing user frustration.

### Example prompts or workflows

_No response_

### Additional context

```shell
$ copilot --resume
Select a session to resume:

# Modified Created Msg Summary

...
▋ 511. 1mo ago 1mo ago 5 What does the `cli/cli` repository say is the best way...
▋ 512. 1mo ago 1mo ago 18 What does the `cli/cli` repository say is the best way...
▋ 513. 1mo ago 1mo ago 4 I'd like for you to display the `cli/cli` repository readme
▋ 514. 1mo ago 1mo ago 41 I would like your help enhancing the `cli` logic within...
▋ 515. 1mo ago 1mo ago 0 (no message content)
▋ 516. 1mo ago 1mo ago 0 (no message content)

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