Update rules_rust

Several changes I made in 971-Robot-Code first have been upstreamed,
including finished a few pieces that I now want to use.

Change-Id: Iac6317989c1d3a0c7886c7d4a5798c6dbcedf2a9
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
diff --git a/third_party/rules_rust/.clang-format b/third_party/rules_rust/.clang-format
new file mode 100644
index 0000000..2296f7d
--- /dev/null
+++ b/third_party/rules_rust/.clang-format
@@ -0,0 +1,3 @@
+---
+BasedOnStyle: Google
+...