Enable ruff/isort rules (I) and fix issues

[DimitriPapadopoulos]

Keep working on https://github.com/zarr-developers/zarr-python/discussions/1701.

TODO:

• [ ] Add unit tests and/or doctests in docstrings
• [ ] Add docstrings and API docs for any new/modified user-facing classes and functions
• [ ] New/modified features documented in docs/tutorial.rst
• [x] Changes documented in docs/release.rst
• [x] GitHub Actions have all passed
• [x] Test coverage is 100% (Codecov passes)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.98%. Comparing base (cb4230d) to head (622e422). Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #1704       +/-   ##
=========================================
+ Coverage      0   99.98%   +99.98%     
=========================================
  Files         0       38       +38     
  Lines         0    14663    +14663     
=========================================
+ Hits          0    14661    +14661     
- Misses        0        2        +2     

Files with missing lines	Coverage Δ
zarr/_storage/absstore.py	100.00% <100.00%> (ø)
zarr/_storage/store.py	100.00% <100.00%> (ø)
zarr/_storage/v3.py	100.00% <100.00%> (ø)
zarr/_storage/v3_storage_transformers.py	100.00% <100.00%> (ø)
zarr/convenience.py	100.00% <100.00%> (ø)
zarr/core.py	100.00% <100.00%> (ø)
zarr/creation.py	100.00% <100.00%> (ø)
zarr/hierarchy.py	99.79% <100.00%> (ø)
zarr/indexing.py	100.00% <ø> (ø)
zarr/meta.py	100.00% <100.00%> (ø)
... and 17 more

... and 11 files with indirect coverage changes

[jhamman]

@DimitriPapadopoulos - thanks for moving your focus over to the v3 branch. I'm going to close this in favor of the contributions you've already made there. 🙏