feat: a reading window acquires the lock when multiple windows are opened with the same publication ID

[panaC]

The lock is acquired by the reader window if :

• The same publication is not already open and this is the first reading window with this publication.
• An another reading window has the lock with this publication but this reading window is closing by the user.

[panaC]

@danielweck I'm merging this PR feel free to comment it in #develop branch. I'm need this for #2704

[danielweck]

That's fine :)
I did read the code diff but without utilisation context the logic is a bit abstract in my mind.
Purely from a technical perspective, I am glad to see that the module-level unbound cache now has a "delete" function ;)