chore: workers manager

[rustatian]

Reason for This PR

ref: roadrunner-server/roadrunner#1728

Description of Changes

• New AddWorker/RemoveWorker feature support.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.]
[Reviewer TODO: Verify that these criteria are met. Request changes if not]

• All commits in this PR are signed (git commit -s).
• The reason for this PR is clearly provided (issue no. or explanation).
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• Any user-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ab1f2c9) 22.67% compared to head (a535b49) 22.67%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #423   +/-   ##
=======================================
  Coverage   22.67%   22.67%           
=======================================
  Files           4        4           
  Lines         269      269           
=======================================
  Hits           61       61           
  Misses        206      206           
  Partials        2        2           

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