refactor: cleanup the code to allow easy extensibility

[Tochemey]

• Abstract remoting into a nice struct called Remoting for client communication
• Use the new remoting struct in PID and ActorSystem to cleanly handle remoting call
• Refactor the cluster client to accept concrete Node instance rather than mere array list of addresses. This help to tailor client connection appropriately to the given node
• Ensure that every http client connection closes appropriately to avoid resource leakage.

[codecov]

Codecov Report

Attention: Patch coverage is 90.14599% with 81 lines in your changes missing coverage. Please review.

Project coverage is 87.76%. Comparing base (7209b33) to head (35f9c93).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
actors/actor_system.go	81.61%	18 Missing and 7 partials ⚠️
actors/remoting.go	91.22%	15 Missing and 5 partials ⚠️
client/client.go	86.17%	8 Missing and 5 partials ⚠️
actors/redistribution.go	69.23%	8 Missing and 4 partials ⚠️
actors/scheduler.go	86.15%	6 Missing and 3 partials ⚠️
actors/pid.go	98.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #505      +/-   ##
==========================================
+ Coverage   87.40%   87.76%   +0.36%     
==========================================
  Files          45       46       +1     
  Lines        4294     4513     +219     
==========================================
+ Hits         3753     3961     +208     
- Misses        426      433       +7     
- Partials      115      119       +4     

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