refactor(enhancement): refactor the actors data structure

[Tochemey]

• Fix bugs
• Revert the DNS feature. Only IP addresses will be used due to this issues Join() fails to resolve unqualified DNS name hashicorp/memberlist#147 and Using DNS names in Config.AdvertiseAddr hashicorp/memberlist#162. At the moment DNS hinder cluster nodes discovery. The best option for the meantime is to set the host to "0.0.0.0" and then GoAkt will figure out the right IP address.
• Refactor the whole actors storage using a tree-like structure
• Refactor codebase
• Remove unnecessary code
• Add two methods to ActorSystem: Host and Port
• Fully tested (cluster mode included)

[codecov]

Codecov Report

Attention: Patch coverage is 90.85366% with 45 lines in your changes missing coverage. Please review.

Project coverage is 86.92%. Comparing base (a4e7ad8) to head (b885bbd).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
actors/actor_system.go	84.46%	13 Missing and 3 partials ⚠️
actors/pid_tree.go	90.41%	11 Missing and 5 partials ⚠️
actors/pid.go	93.41%	9 Missing and 2 partials ⚠️
actors/pid_node.go	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #543      +/-   ##
==========================================
- Coverage   87.00%   86.92%   -0.08%     
==========================================
  Files          46       49       +3     
  Lines        4649     4889     +240     
==========================================
+ Hits         4045     4250     +205     
- Misses        477      502      +25     
- Partials      127      137      +10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.