feat: implement steward-ward pattern for schedule and dispatch goroutines

[svaloumas]

• Adds Scheduler.NewSteward method
• Turns Scheduler.Dispatch and Scheduler.Schedule methods to wards
• Refactors WorkService.Dispatch method

[codecov[bot]]

Codecov Report

Base: 76.73% // Head: 75.74% // Decreases project coverage by -0.99% :warning:

Coverage data is based on head (9ed3ebc) compared to base (732aec4). Patch coverage: 59.77% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   76.73%   75.74%   -1.00%     
==========================================
  Files          32       32              
  Lines        3271     3360      +89     
==========================================
+ Hits         2510     2545      +35     
- Misses        538      593      +55     
+ Partials      223      222       -1     

Flag	Coverage Δ
unittests	75.74% <59.77%> (-1.00%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/core/service/worksrv/service.go	84.87% <29.72%> (-5.23%)	:arrow_down:
internal/core/service/schedulersrv/service.go	68.27% <65.67%> (-27.11%)	:arrow_down:
valet.go	92.30% <100.00%> (+0.64%)	:arrow_up:

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