[roll third_party/pigweed] pw_build: Python API

- Improvements to the BuildCommand and BuildRecipe APIs
- Allow --build-system-commands for pw watch and pw build commands
  to be chained.
- Added logfile related options:
  --logfile FILE to log build output
  --separate-logfiles option to break out build output to a separate
    log file per out directory.
- run_builds() function to execute a collection of BuildRecipes
- run_watch() function to pw-watch a collection of BuildRecipes
- Improvements to the print_build_summary output. Pending builds are
  now shown with slug '...'.
- Hookup -j, --keep-going, and --colors options for bazel

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/124990

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 9f8288e1a29392e..cd4481c13b0fb36
Roller-URL: https://ci.chromium.org/b/8791131133142435713
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If8c5b9fa579159a399fbe883f758de0e24fcf309
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/126832
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 9f8288e..cd4481c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 9f8288e1a29392e9d96c221d6a4b03b254c88c92
+Subproject commit cd4481c13b0fb360b3cf35251cd05083bf58154c