roll: pigweed pw_build: Break apart pigweed.bzl

Overtime, Pigweed unintentionally grew a `pigweed.bzl` file that ended
up being a grab-bag of various Bazel rules. This change breaks up this
file to mirror GN by moving rules into their own individual files,
moving to different modules where appropriate.

Original-Bug: b/370792896
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239133
Original-Revision: 53b16cd8d2907855b13bec9159286927de602a72

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 547e0582fa65c3..53b16cd8d29078
Roller-URL: https://ci.chromium.org/b/8735151260283828785
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6a37af566ddc5fe95beb5295d67a30b050741732
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/239592
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/MODULE.bazel b/MODULE.bazel
index 787d562..dd99e51 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -49,8 +49,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-10-02.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735155535833241457.
-    commit = "547e0582fa65c376af36d0186f4d94a33badc9e3",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735151260283828785.
+    commit = "53b16cd8d2907855b13bec9159286927de602a72",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -58,8 +58,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-10-02.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735155535833241457.
-    commit = "547e0582fa65c376af36d0186f4d94a33badc9e3",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735151260283828785.
+    commit = "53b16cd8d2907855b13bec9159286927de602a72",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )