Updated arguments for diktat-cli

[nulls]

What's done:

• reporter is optional now
• output is required now when reporter is provided
• renamed parameters are related to plain output
• added a new type PLAIN_GROUP_BY_FILE

It closes #1793

[codecov]

Codecov Report

Attention: 75 lines in your changes are missing coverage. Please review.

Comparison is base (02c1a7c) 78.55% compared to head (0029cee) 78.40%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...lin/com/saveourtool/diktat/cli/DiktatProperties.kt	0.00%	61 Missing ⚠️
...ourtool/diktat/ktlint/DiktatReporterFactoryImpl.kt	0.00%	9 Missing ⚠️
.../diktat/ruleset/rules/chapter2/kdoc/KdocMethods.kt	73.68%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1860      +/-   ##
============================================
- Coverage     78.55%   78.40%   -0.15%     
- Complexity     2456     2463       +7     
============================================
  Files           133      133              
  Lines          8654     8688      +34     
  Branches       2189     2200      +11     
============================================
+ Hits           6798     6812      +14     
- Misses          882      897      +15     
- Partials        974      979       +5     

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[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   164 files  ±0     164 suites  ±0   11m 43s ⏱️ + 4m 56s
1 423 tests ±0  1 386 ✔️ ±0  37 💤 ±0  0 ❌ ±0 
2 802 runs  ±0  2 765 ✔️ ±0  37 💤 ±0  0 ❌ ±0 

Results for commit 0029cee. ± Comparison against base commit d14f27d.

♻️ This comment has been updated with latest results.

[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   164 files  ±0     164 suites  ±0   7m 25s ⏱️ +11s
1 423 tests ±0  1 406 ✔️ ±0  17 💤 ±0  0 ❌ ±0 
2 802 runs  ±0  2 785 ✔️ ±0  17 💤 ±0  0 ❌ ±0 

Results for commit 0029cee. ± Comparison against base commit d14f27d.

♻️ This comment has been updated with latest results.