Add config class with validation

[ColinDaglish]

No description provided.

[codecov]

Codecov Report

Patch coverage: 86.25% and project coverage change: +0.56% 🎉

Comparison is base (c4a63a5) 79.82% compared to head (2b35160) 80.38%.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           feature/unit_tests      #17      +/-   ##
======================================================
+ Coverage               79.82%   80.38%   +0.56%     
======================================================
  Files                      17       19       +2     
  Lines                     689      719      +30     
======================================================
+ Hits                      550      578      +28     
- Misses                    139      141       +2     

Files Changed	Coverage Δ
src/modules/preprocessing.py	91.80% <ø> (-1.54%)	⬇️
src/modules/topic_modelling.py	41.66% <0.00%> (ø)
src/run_pipeline.py	0.00% <0.00%> (ø)
tests/modules/test_preprocessing.py	100.00% <ø> (ø)
src/modules/config.py	92.10% <92.10%> (ø)
tests/modules/test_config.py	100.00% <100.00%> (ø)

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