[roll third_party/pigweed] pw_protobuf: More protobuf size reports

Further extends the pw_protobuf size reports to include decoders and
codegen size reports.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110115

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 15961aae7313137..e29d6c08846adba
Roller-URL: https://ci.chromium.org/b/8801832315537317297
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If9cd9481ada86dc52dca5edc67a3d839e263260c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/112269
Bot-Commit: 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 15961aa..e29d6c0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 15961aae731313750b69d1198a0ce03045e49212
+Subproject commit e29d6c08846adba127f34f5279cc3b3a3cf9c1e9