MAINT: adding pyproject.toml

[lizgehret]

testing out pyproject.toml to mostly replace setup.py - proof of concept here and then will think about expanding to all q2-plugins.

[lizgehret]

TODOs:

• fix broken conda
• move everything over to pyproject.toml so that setup.py & friends can all be fully deleted

[lizgehret]

alright this is still completely falling over at the build-package step. tricky to troubleshoot with the actionAdapter. going to pivot to curveplot fot the next week and come back to this.

[lizgehret]

so a weird thing is happening here where the checkout action isn't using the correct ref, which isn't allowing any tags to be pulled from vizard's repo - it's just checking out the merge ref which is putting it in a detached head state. this is where the discrepancy between versions is coming from... i'm going to merge this PR to see if after the changes here are incorporated into main, this resolves the issue - but will continue to address in a new PR if this doesn't fix it.