[roll third_party/pigweed] pw_env_setup: Adds CIPD Bazel rules

Adds a set of Bazel rules for fetching the cipd client and downloading
CIPD based dependencies as Bazel remote repositories.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45140

third_party/pigweed Rolled-Commits: 640c75c80fe327c..e22ac20e5e7dc65
Roller-URL: https://ci.chromium.org/b/8846159211844989120
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8846159211844989120
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id12447e03e54b63cc0a48a6ee1c8763793d460cc
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/47085
Reviewed-by: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 640c75c..e22ac20 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 640c75c80fe327ca4a00d1d064550866bffce39a
+Subproject commit e22ac20e5e7dc65a5ddf5b9397f6407957683de7