Make writing tests for WRONG_INDENTATION checks easier

[0x6675636b796f75676974687562]

What's done:

• Added annotation-based configuration with minimum boilerplate code.

[codecov]

Codecov Report

Merging #1499 (529fc5f) into master (f791e1a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1499   +/-   ##
=========================================
  Coverage     82.95%   82.96%           
  Complexity     2574     2574           
=========================================
  Files           111      111           
  Lines          7710     7712    +2     
  Branches       2114     2114           
=========================================
+ Hits           6396     6398    +2     
  Misses          418      418           
  Partials        896      896           

Flag	Coverage Δ
unittests	82.96% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...set/rules/chapter3/files/IndentationConfigAware.kt	81.25% <ø> (ø)
...at/ruleset/rules/chapter3/files/IndentationRule.kt	75.48% <ø> (-0.29%)	⬇️
...uleset/rules/chapter3/files/IndentedElementType.kt	100.00% <ø> (ø)
...otlin/org/cqfn/diktat/ruleset/utils/StringUtils.kt	88.88% <100.00%> (+1.01%)	⬆️
...tat/ruleset/utils/indentation/IndentationConfig.kt	91.30% <100.00%> (+0.82%)	⬆️

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[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v1)

1 300 tests   1 285 ✔️  1m 17s ⏱️
   157 suites       15 💤
   157 files           0 ❌

Results for commit 05fff45.

♻️ This comment has been updated with latest results.

[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v1)

1 315 tests   1 300 ✔️  3m 13s ⏱️
   158 suites       15 💤
   158 files           0 ❌

Results for commit 05fff45.

♻️ This comment has been updated with latest results.