[Feature]: Refactor tox.ini to match HDMF

[mavaylon1]

What would you like to see added to HDMF-ZARR?

A few months ago, HDMF "simplified" tox.ini. After updating for 3.12 support, we should refactor to a similar form.

Is your feature request related to a problem?

No response

What solution would you like?

Above.

Do you have any interest in helping implement the feature?

Yes.

Code of Conduct

• I agree to follow this project's Code of Conduct
• Have you checked the Contributing document?
• Have you ensured this change was not already requested?

[rly]

As @mavaylon1 and I discussed, the current verbose tox.ini form in hdmf-zarr is fine, so this refactor is not necessary.