Implement RemoteDownloader w/ `--experimental_remote_downloader`

This is the Bazel client implementation of https://github.com/bazelbuild/proposals/pull/160. It allows downloading of external dependencies to be delegated to a remote service.

TODOs:
- [x] Once https://github.com/bazelbuild/remote-apis/pull/112 is merged, the vendored copy of `bazelbuild/remote-apis` should be updated. I've used a [WIP] placeholder for now.
- [x] If the general approach looks reasonable then I'll add tests. Currently I've been testing with an in-house implementation of the downloader server.

R: @buchgr @dslomov
CC: @EricBurnett @sstriker @ulfjack

Closes #10622.

PiperOrigin-RevId: 300116716
9 files changed
tree: 8a77cd86dcf1249129e8bf6fc08c4a0ba43055b1
  1. .bazelci/
  2. .bazelrc
  3. .gitattributes
  4. .gitignore
  5. AUTHORS
  6. BUILD
  7. CHANGELOG.md
  8. CODEOWNERS
  9. CONTRIBUTING.md
  10. CONTRIBUTORS
  11. ISSUE_TEMPLATE.md
  12. LICENSE
  13. README.md
  14. WORKSPACE
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. distdir.bzl
  19. examples/
  20. scripts/
  21. site/
  22. src/
  23. third_party/
  24. tools/
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