[v3] Test environments and CI

[jhamman]

We just merged #1592 which should make managing our various test environments much easier going forward. This ticket lays out a number of small tasks that can be taken to modernize our test environments and GitHub Actions Workflows. I'm sure I'm missing a few things here so feel free to comment / suggest alternatives.

Hatch related improvements

• Define dev environments in pyproject.toml using Hatch environments
  • Move requirements_dev_*.txt defining separate environments for "minimal", "dev". These should include parameterizations over python versions (3.10 and 3.11).
  • Use these environments in our GitHub actions
• Split out "minimal" environment into two separate environments
  • Minimum supported versions of all dependencies (see Proposal: Zarr-Python should adopt the Scientific Python spec for minimum supported versions #1616)
  • Minimal dependencies (latest versions)
• Create "docs" environment so developers can simply run: hatch run docs:serve

GitHub Actions related improvements

• Explore removing the need to install a conda environment, instead relying on pure hatch environments
• Explore combining the "windows", "minimal", and "python-package" workflows into a single workflow
• Run Mypy checks in each matrix run in addition to our pre-commit script

[rabernat]

I want to help with this and am motivated to get it done by tomorrow in time for the Zarr sprint.

[jhamman]

Quick update here. @rabernat got a good start on an initial Hatch env / CI setup in #1650. Still more to do here thought so leaving this open with the flag: help wanted.

[maxrjones]

I'm planning to work on this at the Zarr sprint today, unless Ryan or others already plan to

[maxrjones]

FYI I think the initial task list in this issue is complete now that #1728 is merged

[dstansby]

Yep, I think this can be closed

[jhamman]

Before we do, it would be nice to get a windows test environment up and running.

[jhamman]

After #2423 and #2418 go in, the last thing here is to get some diversity in platform into the test suite. Would be good to get at least 1 windows and MacOS entry in the main test matrix.