rpk: wrap usage message for flags

[r-vasquez]

Cover letter

Cosmetic change: We still have some flags with long usage text, now we will wrap the usages according to the terminal width at the moment of executing rpk.

See following image as an example:

^ (Top command is before the changes)

Backport Required

• [ ] not a bug fix
• [ ] issue does not exist in previous branches
• [ ] papercut/not impactful enough to backport
• [ ] v22.3.x
• [ ] v22.2.x
• [ ] v22.1.x

UX changes

• none

Release notes

• none