Move uuid to //aos:uuid

It is getting usage significantly further outside the logger.  Time to
promote it somewhere better.  I only see it getting used more.

Change-Id: I754739347212f5a3154f68c7b7fc84b9a9074d90
diff --git a/aos/BUILD b/aos/BUILD
index b87f7bc..535c0b2 100644
--- a/aos/BUILD
+++ b/aos/BUILD
@@ -595,3 +595,26 @@
     srcs = ["flatbuffers_static.py"],
     visibility = ["//visibility:public"],
 )
+
+cc_library(
+    name = "uuid",
+    srcs = ["uuid.cc"],
+    hdrs = ["uuid.h"],
+    target_compatible_with = ["@platforms//os:linux"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_github_google_flatbuffers//:flatbuffers",
+        "@com_github_google_glog//:glog",
+        "@com_google_absl//absl/types:span",
+    ],
+)
+
+cc_test(
+    name = "uuid_test",
+    srcs = ["uuid_test.cc"],
+    target_compatible_with = ["@platforms//os:linux"],
+    deps = [
+        ":uuid",
+        "//aos/testing:googletest",
+    ],
+)