Replaced imaging module with exploded image module

[rgaudin]

This reuses the exploded imaging code from #36 with some modifications:

• removed the optimization module as this requires further discussions
• harmonized method signatures
• better annotations and docstrings

API changes:

• changed create_favicon() param names (source_image -> src, dest_ico -> dst)
• changed save_image() param names (image -> src)
• changed get_colors() param names (image_path -> src)
• changed resize_image() param names (fpath -> src)

[codecov[bot]]

Codecov Report

Merging #49 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #49   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           19        22    +3     
  Lines          783       798   +15     
=========================================
+ Hits           783       798   +15     

Impacted Files	Coverage Δ
src/zimscraperlib/constants.py	100.00% <100.00%> (ø)
src/zimscraperlib/image/__init__.py	100.00% <100.00%> (ø)
src/zimscraperlib/image/convertion.py	100.00% <100.00%> (ø)
src/zimscraperlib/image/probing.py	100.00% <100.00%> (ø)
src/zimscraperlib/image/transformation.py	100.00% <100.00%> (ø)

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