Make linting work for tests folder

[zain-sohail]

Next step is to fix the lint errors in tests. For that we should also consider if we want same level of lint errors as for base module or not.

Further step is to introduce ruff instead of pylint.

Closes #255

[coveralls]

Pull Request Test Coverage Report for Build 6851839863

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.04%) to 90.391%

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Files with Coverage Reduction	New Missed Lines	%
sed/binning/binning.py	1	96.62%
sed/binning/utils.py	1	83.93%

Totals
Change from base Build 6848896105:	-0.04%
Covered Lines:	4920
Relevant Lines:	5443

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💛 - Coveralls