[roll third_party/pigweed] pw_{metric,router,tokenizer,string}: Soong updates

- Add Soong blueprints to pw_metric, and pw_router.
- Add pw_tokenizer library which uses rules in the added blueprints.
- Update modules to expose public header files from deps.

Tested: mm in Android checkout and built internal project.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/146491

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: fbee260fd2a8147..cde2f3ab68d8a5e
Roller-URL: https://ci.chromium.org/b/8780284842813567073
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5f62db19a3b6ddfded0cc49ccc40938f4ef3d01e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/148511
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 fbee260..cde2f3a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit fbee260fd2a8147e93a2a7ea16492407f87eb5c0
+Subproject commit cde2f3ab68d8a5e0dbf0a0786954cfa2f50296bb