Fixed #13376: Added restrictions to messages to control when they are hidden.

[nanorepublica]

Trac ticket number

ticket-13376

Branch description

This PR adds the ability to control when a message is hidden from view.

Currently there is restrictions for the number of times a message is iterated over and for an expiry time.

Checklist

• This PR targets the main branch.
• The commit message is written in past tense, mentions the ticket number, and ends with a period.
• I have checked the "Has patch" ticket flag in the Trac system.
• I have added or updated relevant tests.
• I have added or updated relevant docs, including release notes if applicable.
• I have attached screenshots in both light and dark modes for any UI changes.

[github-actions]

Hello! Thank you for your contribution 💪

As it's your first contribution be sure to check out the patch review checklist.

If you're fixing a ticket from Trac make sure to set the "Has patch" flag and include a link to this PR in the ticket!

If you have any design or process questions then you can ask in the Django forum.

Welcome aboard ⛵️!

[nanorepublica]

This is my initial application of the last patch attached to the Trac ticket.

There is more to do to apply the full patch, which I will be adding soon