chore!: refactor preproc and postproc into transforms module

[ab93]

• Move preprocess and postprocess files & modules -> transforms
• Avoid setting up handler in loggers
• Add base classes for extensibility

Note: Coverage is failing due to some other network issue, not related to the PR.

[codecov[bot]]

Codecov Report

Merging #201 (9dabd71) into main (7b3531a) will decrease coverage by 0.23%. The diff coverage is 97.40%.

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
- Coverage   96.29%   96.07%   -0.23%     
==========================================
  Files          36       38       +2     
  Lines        1567     1578      +11     
  Branches      124      124              
==========================================
+ Hits         1509     1516       +7     
- Misses         42       45       +3     
- Partials       16       17       +1     

Impacted Files	Coverage Δ
numalogic/tools/types.py	90.00% <60.00%> (-10.00%)	:arrow_down:
numalogic/__init__.py	100.00% <100.00%> (ø)
numalogic/base.py	100.00% <100.00%> (ø)
numalogic/config/factory.py	97.91% <100.00%> (ø)
numalogic/models/autoencoder/base.py	98.30% <100.00%> (-0.03%)	:arrow_down:
numalogic/models/forecast/variants/naive.py	97.40% <100.00%> (ø)
numalogic/models/threshold/_static.py	100.00% <100.00%> (ø)
numalogic/models/threshold/_std.py	93.93% <100.00%> (ø)
numalogic/registry/redis_registry.py	97.61% <100.00%> (ø)
numalogic/transforms/__init__.py	100.00% <100.00%> (ø)
... and 4 more

... and 1 file with indirect coverage changes

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