[roll third_party/pigweed] pw_protobuf_compiler: Decouple proto packaging from directory

- Allow specifying prefix and strip_prefix arguments for proto files.
  The proto directory tree is built as specified in the out directory.
- Only invoke protoc from the default toolchain. This prevents duplicate
  protoc invocations.
- Prevent duplicate pw_proto_library Python package definitions anywhere
  in the build.
- Replace implicit handling of standalone external protos with a
  python_package_as_module option.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/34640

third_party/pigweed Rolled-Commits: 89dd053917abc44..752d7d3459ac4f7
CQ-Do-Not-Cancel-Tryjobs: true
Roller-URL: https://ci.chromium.org/b/8853567551272856128
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8853567551272856128
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I699081e2b4f78ae9784b2b5a59aa1f65a0dfc2d7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/36000
Reviewed-by: 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 89dd053..752d7d3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 89dd053917abc4469b8b496bbefc0e8a5d226f66
+Subproject commit 752d7d3459ac4f74e2eed8ab5349d774d1f99beb