[Blending] OpenCV - SeamlessClone Method

[jpennors]

This PR :

• adds a new blending method from openCV : seamlessClone
• creates an iteration process to test different blending methods

A quick example for seamlessClone :

[MateoLostanlen]

HI @jpennors! Thank you for your PR. Two small things:

1. In my opinion this error has nothing to do with the function you added but rather with the choice of crop / image size. If this is the case it would be better to open an issue on the subject
2. When you open a PR it is important that you explain even quickly what you have done which makes the review easier

[jpennors]

Yes @MateoLostanlen, the PR is still in progress, I should have open a draft one !

[MateoLostanlen]

HI @jpennors, could be nice to integrate this method, do you still have issues ?

[jpennors]

@MateoLostanlen Same as sky detection with gradient. I still think it's relevant to keep for now

[codecov]

Codecov Report

Merging #2 (7b37f52) into main (2f576c4) will decrease coverage by 1.39%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
- Coverage   90.16%   88.77%   -1.40%     
==========================================
  Files           5        5              
  Lines         183      187       +4     
==========================================
+ Hits          165      166       +1     
- Misses         18       21       +3     

Flag	Coverage Δ
unittests	88.77% <25.00%> (-1.40%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
syntheticdataset/image_blending.py	89.28% <25.00%> (-10.72%)	⬇️

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