dev: support for multiple GUI sessions

[VEDA95]

As it currently stands the GUI is built in a way that there's only one session in memory for persisting data as long as the GUI is running. However, since the GUI can be used like a traditional web app outside of pywebview this may cause unintended side effects if multiple users decide to use the GUI at the same time. While I understand the goal is to build around a single-user experience (hence the reason for using pywebview), I think it would be a handicap from for groups or teams that might want to access a single instance of the web app. Furthermore, traditionally web apps are built with multi-user experiences in mind anyways,and it's something we shouldn't shy away from. As a way to accomplish this I propose refactoring how sessions work and implementing the ability to handle multiple gui sessions.

[KristijanArmeni]

Thanks @VEDA95. Cool thoughts. Just for my better understanding:

However, since the GUI can be used like a traditional web app

I thought for the foreseeable future that wouldn't be the direction to take since we'd want to first build a local-only app, that wouldn't be hosted as an app anywhere on the web (in order to keep data offline)? At least if my reading of "traditional web app" is correct?

[VEDA95]

@KristijanArmeni the intention would still be to run the web app locally, ideally on the user's machine. However, what if you have multiple people using the same machine that want access to the GUI? That or in a similar scenario what if multiple people or teams want to access it over the same local network (not talking about internet when I say this)? Even if isn't accessible over the internet those are scenarios the GUI should be able to handle gracefully