refactor!: complete refactoring of the code to account for cluster

[Tochemey]

• Properly take into account cluster mode when sending command
• Complete change how to create an entity
• Complete change on how to send command to an entity
• Remove the need of an Entity object
• Remove the need of generic for EntityBehavior
• Make eGo engine thread safe

[codecov]

Codecov Report

Attention: Patch coverage is 75.24752% with 25 lines in your changes missing coverage. Please review.

Project coverage is 77.33%. Comparing base (e7ede34) to head (f7767f6).

Files	Patch %	Lines
engine.go	72.82%	17 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   77.14%   77.33%   +0.18%     
==========================================
  Files          21       20       -1     
  Lines        1536     1575      +39     
==========================================
+ Hits         1185     1218      +33     
- Misses        224      228       +4     
- Partials      127      129       +2     

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