Add debug command

[samdark]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	yiisoft/yii-debug#270

[codecov]

Codecov Report

Attention: Patch coverage is 35.93750% with 41 lines in your changes missing coverage. Please review.

Project coverage is 75.88%. Comparing base (a3b3e09) to head (c412d52).

Files with missing lines	Patch %	Lines
src/Command/DebugEventsCommand.php	35.93%	41 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##              master      #73       +/-   ##
==============================================
- Coverage     100.00%   75.88%   -24.12%     
- Complexity        47       65       +18     
==============================================
  Files              5        6        +1     
  Lines            106      170       +64     
==============================================
+ Hits             106      129       +23     
- Misses             0       41       +41     

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