feat: Allow a delpy before and after message is send

[JumpLink]

This is part of the user feedback, after the thank you message is rendered, a delay should be added before the next callouts are listed.

Changes

• New Renderer properties afterDelay and beforeDelay for a delay after and before the message is sent
• Wait 3000 milliseconds after the thank you message (and before the list callout message) is send
• Update beabee-common and corresponding changes to the interface names
• Some cleanups

[rlafuente]

looks good -- 3 sec sounds like a reasonable amount, but user testing will tell :-) regarding the code I don't have useful input here. Good one!