Assertj json extension

[jmarchionatto]

AssertJ extension utility to validate Json strings

• Reduces need to use nested double quotes
• Reports all errors present

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.49%. Comparing base (497b9f2) to head (6269585). Report is 116 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6039 +/- ## ============================================ + Coverage 83.39% 83.49% +0.09% - Complexity 26927 27368 +441 ============================================ Files 1681 1703 +22 Lines 103965 105961 +1996 Branches 13189 13378 +189 ============================================ + Hits 86702 88469 +1767 - Misses 11613 11769 +156 - Partials 5650 5723 +73 ```

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