Send and receive work requests via proxy and multiplexer

This is the attempt to solve issue #2832.
The design doc has been approved [Multiplex persistent worker](https://docs.google.com/document/d/1OC0cVj1Y1QYo6n-wlK6mIwwG7xS2BJX7fuvf1r5LtnU/edit?usp=sharing).

Two minor design changes from design doc
- Number of WorkerProxy is still limited by `--worker_max_instances`.
- We merge worker multiplexer sender and receiver to one WorkerMultiplxer, WorkerProxy sends request to worker process directly.

Closes #6857.

PiperOrigin-RevId: 274560006
19 files changed
tree: 3d1a8358d9f82581f7f3c5cdaaf89c4d95bace18
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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