Feature/pytest markers

[bruvio]

closes #15

added pytest markers
and moved flake8 config outside pyproject.toml as not supported by poetry.
refactored some code using sourcery

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #29 (0262290) into dev (5d2b6cb) will decrease coverage by 0.23%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##              dev      #29      +/-   ##
==========================================
- Coverage   85.12%   84.89%   -0.24%     
==========================================
  Files           7        5       -2     
  Lines         511      503       -8     
==========================================
- Hits          435      427       -8     
  Misses         76       76              

Impacted Files	Coverage Δ
fairdatapipeline/fdp_utils.py	84.53% <89.74%> (ø)
fairdatapipeline/link.py	87.17% <90.32%> (ø)
fairdatapipeline/pipeline.py	91.71% <92.53%> (ø)
fairdatapipeline/__init__.py	100.00% <100.00%> (ø)
fairdatapipeline/raise_issue.py	69.51% <100.00%> (ø)

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