Disable Magic Number in test

[kentr0w]

What's done:

• Added option
• Added test
• Closes There should be an option to disable MAGIC_NUMBER rule in test sources  #832

[codecov]

Codecov Report

Merging #879 (5ca01f2) into master (6de6a62) will decrease coverage by 0.00%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #879      +/-   ##
============================================
- Coverage     83.53%   83.52%   -0.01%     
- Complexity     2210     2211       +1     
============================================
  Files           101      101              
  Lines          5677     5681       +4     
  Branches       1620     1624       +4     
============================================
+ Hits           4742     4745       +3     
  Misses          256      256              
- Partials        679      680       +1     

Flag	Coverage Δ	Complexity Δ
unittests	83.52% <83.33%> (-0.01%)	2211.00 <4.00> (+1.00)	⬇️

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Impacted Files	Coverage Δ	Complexity Δ
...n/diktat/ruleset/rules/chapter3/MagicNumberRule.kt	85.10% <80.00%> (-0.95%)	28.00 <4.00> (+1.00)	⬇️
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	84.77% <100.00%> (ø)	0.00 <0.00> (ø)

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