create a development environment

[keewis]

• [x] closes #10990

We have quite a few environments now, but for development there are a few other tools needed. So far, we have:

• ipython, black, and ipdb
• pytest-accept

Feel free to accept other tools that need access to the environment. (This environment explicitly excludes typing, but it shouldn't be too hard to add another one should we need it).

Note: environments are only materialized once they are accessed, so if you never use the dev env, pixi should never download and install pytest-accept.

cc @Illviljan