Add connection time and memory usage limits

[MrAntoine77]

This PR introduces two new optional fields to the login process, allowing the capture to stop automatically:

• After a specified duration (in seconds)
  https://github.com/user-attachments/assets/d9625211-76ca-4405-a367-e814e15c6991
• After a specified memory usage (in megabytes)
  https://github.com/user-attachments/assets/4ef2493d-12bb-4053-b284-5921ffb43285

Setting either value to 0 disables the corresponding limit.

[wolfpld]

The memory limit is a duplication of already existing functionality (about window -> global settings -> memory limit).

I don't like the amount of clutter this change introduces. It should be hidden by default.

[Lectem]

I reworked the whole PR based on @MrAntoine77's work.
This now only adds the connection duration limit.

I think it may be interesting to allow an option for quick edit of some settings (perhaps making the about windows a real window that the user can keep open would be enough?). But that's a question for another issue/PR I think now.