pyproject.toml missing hatch matrix definition

[jeskowagner]

Hi,
I think that pyproject.toml could benefit from the addition of a hatch matrix definition, such as:

[[tool.hatch.envs.hatch-test.matrix]]
python = ["3.10", "3.11", "3.12"]
features = ["test"]

At least for me, running tests locally with hatch test fails without this addition, because hatch considers my active Python version to be compatible and doesn't launch into a testing environment but just uses my local environment. In fact, I am not sure these two lines have any effect while testing. In the docs they use the matrix definition, although for granular dependency management they do seem to use tool.hatch.envs.hatch-test (i.e. not matrix) (see here).