tools: Handle smaller terminal sizes in replay

[mpurnell1]

Description

When running op replay --demo in VS Code (or any terminal with a custom size), the terminal height can be too small to display all the available commands. This was not being detected, leading to a bad experience for terminals smaller than 23 rows. The help is now only conditionally added, along with a suggestion to enlarge the terminal, if there is room.

Verification

op replay --demo on screen height < 23 before:

op replay --demo on screen height < 17 before:

op replay --demo on screen height < 23 after:

op replay --demo on screen height < 17 after:

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