Move HoconLoader to junit5 utils.

[tomaszmichalak]

Fragments modules refactor: Knotx/knotx-fragments#154. Move HoconLoader from Knot.x Fragments to Knot.x JUnit5.

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 not work as expected)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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[codecov[bot]]

Codecov Report

Merging #56 into master will increase coverage by 0.33%. The diff coverage is 89.47%.

@@             Coverage Diff              @@
##             master      #56      +/-   ##
============================================
+ Coverage     84.02%   84.36%   +0.33%     
- Complexity      222      241      +19     
============================================
  Files            25       27       +2     
  Lines           864      921      +57     
  Branches         63       65       +2     
============================================
+ Hits            726      777      +51     
- Misses          101      106       +5     
- Partials         37       38       +1     

Impacted Files	Coverage Δ	Complexity Δ
...est/java/io/knotx/junit5/util/HoconLoaderTest.java	88.46% <88.46%> (ø)	10.00 <10.00> (?)
...rc/main/java/io/knotx/junit5/util/HoconLoader.java	90.32% <90.32%> (ø)	9.00 <9.00> (?)

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