Improved command and query handling

[alanbem]

• check if aggregate supports given command
• check if listener supports given query

[codecov]

Codecov Report

Merging #138 (0aef8d9) into master (6281b92) will decrease coverage by 0.14%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master     #138      +/-   ##
============================================
- Coverage     99.92%   99.78%   -0.15%     
- Complexity     1048     1054       +6     
============================================
  Files           119      119              
  Lines          2730     2736       +6     
============================================
+ Hits           2728     2730       +2     
- Misses            2        6       +4     

Impacted Files	Coverage Δ
src/Domain/Command/Handling.php	94.59% <33.33%> (-5.41%)	⬇️
src/Domain/Query/Handling.php	93.33% <33.33%> (-6.67%)	⬇️

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