[roll third_party/pigweed] pw_rpc: Parse Service and Method classes

Data classes to hold RPC Service and Method info. These are constructed
from a proto descriptor binary that is generated as part of the build.

Original-Bug: b/194329554
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/59543

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 06f856908a0aceb..1419a49dba373d9
Roller-URL: https://ci.chromium.org/b/8835950355231703921
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8835950355231703921
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia1365d461c6b4f53918750980b02a161ee2e411a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/61181
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 06f8569..1419a49 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 06f856908a0aceb1c80b8a276f980a639be92b43
+Subproject commit 1419a49dba373d991bd2134a8dd41d775edce0df