add cosmic workspace protocol v2

[morr0ne]

This PR introduces version 2 of the workspace protocol, which resolves the naming conflicts between events and requests. I’ve renamed the conflicting events to "destroyed," as this more accurately reflects their purpose. I’ve gone through the code and updated it accordingly, though there may be areas I missed.

Regarding the copyright header, I assume I need to add myself to provide the necessary permissions. However, I’ve held off on that for now since I haven’t rolled out a protocol before, so any guidance here would be helpful.

Marking this as a draft for now, as it's still open for feedback and further discussion.

fixes #36

[ids1024]

Note that as of recently, COSMIC isn't the only project using cosmic-workspace-unstable-v1: LBCrion/sfwbar#212, labwc/labwc#2030. Which makes introducing a v2 protocol a bit less ideal.

Wayland-protocols is trying to get better at merging protocols in a reasonable timeframe, so perhaps it would be possible to address any remaining issues with https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/40 and finally get that merged upstream, so we can replace the COSMIC protocol with that one instead.

[ids1024]

https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/40 has indeed been making some progress, and hopefully can be approved and merged in to not too distant future.