[roll third_party/pigweed] pw_system: Python package

- Initial pw_system Python package with the console copied from
  rpc_console.py

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/72980

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 4a5c13cd9cb233b..7e1b06ed77c79ca
Roller-URL: https://ci.chromium.org/b/8828303262981979377
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8828303262981979377
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I59414cf13db38ee2a9e988170d5c3731d6ae135a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/73083
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 4a5c13c..7e1b06e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4a5c13cd9cb233b480a77f356f906008e7834e34
+Subproject commit 7e1b06ed77c79caeb8a6f5c60775693a9395f993