Setup pre-commit hooks and apply linters

[observingClouds]

Description

The setup.cfg and pyproject.toml have settings for linters like black, isort, mypy setup but are not applied to the codebase.
This PR applies the linters and adds a .pre-commit-config.yaml so e.g. the pre-commit.ci could be set up to ensure linting in the future.

Contributor Declaration

By opening this pull request, I affirm the following:

• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[github-actions]

Caution

This pull request contains changes to GitHub workflows!
Proceed with caution and if not sure, contact your GitHub admin.

[github-actions]

Caution

This pull request contains changes to GitHub workflows!
Proceed with caution and if not sure, contact your GitHub admin.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.76%. Comparing base (44ecc62) to head (c572173).

Files with missing lines	Patch %	Lines
cfgrib/cfmessage.py	0.00%	1 Missing ⚠️
cfgrib/dataset.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #439   +/-   ##
=======================================
  Coverage   41.76%   41.76%           
=======================================
  Files          26       26           
  Lines        2227     2227           
  Branches      195      195           
=======================================
  Hits          930      930           
  Misses       1297     1297           

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[iainrussell]

Many thanks @observingClouds - a useful addition!