Integration with dandelion

[zktuong]

Some initial code that should work with dandelion to convert between the two instances from zktuong/dandelion#49 onwards.

Still need to work in the extra bits on fully initialized scirpy and dandelion objects.

[grst]

Added some comments, I hope I'm not too nitpicky ;)

Eventually, we'll need to add tests for that as well, but you can also leave that to me.

[grst]

Ah, and you'll need to run the black formatter as well.
The easiest way to ensure that is to use the pre commit hook - it will format on every git commit.

To set it up, run the following commands in the root of the repository

pip install pre-commit
pre-commit install

[zktuong]

This is almost ready for review. I'm just trying to solve some bugs with my github actions on dandelion's side holding up further work; seems like the actual tests on this side are working for now, pending updates to #241, but the docs are failing - seems unrelated?.

[grst]

The docs complain about something with the type annotations... don't see how this would be related since no type annotations have changed in this PR.

I'll finally dedicate some time to scirpy next week, but I would like to finish up #230 first, before I look into #241.
Is this blocking anything on your side?

[zktuong]

Nope all good - take your time.

[grst]

This is now merged into #241. I'll keep you posted!