feat: messages scheduler

[Tochemey]

close #124

[codecov]

Codecov Report

Attention: 56 lines in your changes are missing coverage. Please review.

Comparison is base (c737ed2) 90.76% compared to head (69d905d) 89.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
- Coverage   90.76%   89.88%   -0.88%     
==========================================
  Files          39       40       +1     
  Lines        3584     3826     +242     
==========================================
+ Hits         3253     3439     +186     
- Misses        262      308      +46     
- Partials       69       79      +10     

Files	Coverage Δ
actors/actor_system.go	90.48% <100.00%> (+0.31%)	⬆️
actors/pid.go	94.92% <100.00%> (ø)
cluster/cluster.go	77.70% <84.44%> (+1.15%)	⬆️
actors/scheduler.go	72.62% <72.62%> (ø)

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