Support save_key that is non-dependent of git/cwd, but rather on a per-session basis

[ema2159]

Hello. I was trying out your plugin and I really love the concept. However I was wondering why the bookmarks need have the cwd or git as a reference and not be stored without such a reference, but rather using the current session? At work, there is a significant amount of time I work outside of git (unfortunately, and there's not much I can do about it), and I have the vim.opt.autochdir = true option configured, so each time I move to a file that is on a different directory, arrow messes up the marks.

I figured that I could set the global bookmarks setting to make it work the way I described, but then my bookmarks are (surprise surprise) global, which interferes when I have two Neovim sessions open which I do quite often when for example, when I am working in two different non-git repositories (or one git repository and one non-git repository, you get the idea).

Is there a way to support a per-session bookmarks functionality? Currently and as far as I could examine in the code it is not possible. I can help with the implementation if needed, but I want to know that it is something you would be willing to support.

Thanks again for the great plugin!