feature: streaming support

[rustatian]

Reason for This PR

ref: roadrunner-server/roadrunner#923

Description of Changes

• Update static pool to support streaming capabilities.
• Remove stop worker handler. worker::stop would be deprecated as unused in RR 2023.3.

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]

Codecov Report

Merging #82 (2ca42bd) into master (d72a218) will decrease coverage by 0.67%.
Report is 1 commits behind head on master.
The diff coverage is 67.81%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   83.09%   82.42%   -0.67%     
==========================================
  Files          22       22              
  Lines        1922     1952      +30     
==========================================
+ Hits         1597     1609      +12     
- Misses        270      292      +22     
+ Partials       55       51       -4     

Files Changed	Coverage Δ
payload/payload.go	100.00% <ø> (ø)
state/process/state.go	85.00% <ø> (ø)
pool/static_pool/workers_pool.go	70.68% <56.25%> (ø)
worker/worker.go	83.47% <75.64%> (-1.26%)	⬇️
pool/static_pool/stream.go	84.61% <84.61%> (ø)
pool/allocator.go	87.50% <100.00%> (ø)
worker_watcher/worker_watcher.go	86.98% <100.00%> (-2.06%)	⬇️

... and 2 files with indirect coverage changes