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Design doc: https://docs.google.com/document/d/1SNrFzWCXb4KaegXH8nokilOHGSkTFvLfhK75ZwmIKaE/edit?usp=sharing

This CL introduces //third_party/androidx/fetch_all_androidx.py which
retrieves androidx dependencies from snapshots in
https://androidx.dev/snapshots/latest/artifacts and runs
//third_party/android_deps/fetch_all.py

The version of the androidx dependencies is generated based on
information in https://androidx.dev/snapshots/latest/artifacts/BUILD_INFO

The CL also:
- Fixes fetch_all.py --ignore-vulnerabilities command line parameter to
  skip 'dependencyCheckAnalyze' step.
- Adds the 'useDedicatedAndroidxDir' parameter to build.gradle to
replace androidx dependencies in //third_party/android_deps with a
java_group() which points to the target declaration in
//third_party/androidx

BUG=1064277

Change-Id: I652e56a9721154487c10fafaa2008fc728b9d8b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399773
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812961}