CIF-1182 - Use the same property type in components with product DnD

[cjelger]

• moved postprocessor from components repo to this repo
• added feature to be able to select the product attribute to be saved in the JCR node property

How Has This Been Tested?

Extended unit tests and manually tested.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes and the overall coverage did not decrease.
• [x] All unit tests pass on CircleCi.
• [x] I ran all tests locally and they pass.

[codecov[bot]]

Codecov Report

Merging #105 into master will increase coverage by 0.08%. The diff coverage is 90.00%.

@@             Coverage Diff              @@
##             master     #105      +/-   ##
============================================
+ Coverage     87.37%   87.45%   +0.08%     
- Complexity      438      454      +16     
============================================
  Files            32       33       +1     
  Lines          1734     1794      +60     
  Branches        255      272      +17     
============================================
+ Hits           1515     1569      +54     
- Misses          101      102       +1     
- Partials        118      123       +5     

Flag	Coverage Δ	Complexity Δ
#integration	50.69% <8.33%> (-1.61%)	249.00 <3.00> (+2.00)	:arrow_down:
#karma	92.71% <ø> (ø)	0.00 <ø> (ø)
#unittests	83.62% <90.00%> (+0.24%)	438.00 <16.00> (+16.00)

Impacted Files	Coverage Δ	Complexity Δ
...stprocessor/MultiFieldDropTargetPostProcessor.java	90.00% <90.00%> (ø)	16.00 <16.00> (?)

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[mhaack]

Verified