Implementation (but not plumbing) of the gRPC remote downloader

Extracted from https://github.com/bazelbuild/bazel/pull/10622

Per discussion on that PR, there's still some unanswered questions about how exactly we plumb the new `Downloader` type into `RemoteModule`. And per https://github.com/bazelbuild/bazel/issues/10742#issuecomment-595633454, it is unlikely that even heroic effort from me will get the full end-to-end functionality into v3.0.

Given this, to simplify the review, I'm taking some of the bits the reviewer is happy with and moving them to a separate PR. After merger, `GrpcRemoteDownloader` and its tests will exist in the source tree, but will not yet be available as CLI options.

R: @michajlo
CC: @adunham-stripe @dslomov @EricBurnett  @philwo @sstriker

Closes #10914.

PiperOrigin-RevId: 299908615
16 files changed
tree: e9ba18c791615ae149ac1b270bdffeefac357746
  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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