Validate flatbuffers before printing in aos_dump, log_cat, and simulated_event_loop

We had a corrupted flatbuffer being logged, and the error was very poor
when it was being printed.  Let's try to catch this a lot earlier.

Fix 1: log_cat should validate before printing.  That'll prevent us
from wasting time debugging why it is crashing and point the finger a
lot better.

Fix 2: aos_dump should do the same.  That'll save us from nasty crashes
there too and focus attention a lot better.

Fix 3: SimulatedEventLoop sender Send should also validate in debug
mode.  This will avoid too big a performance hit in the fast path, but
will catch corrupted flatbuffers in any simulations we do, or any log
replay that gets done with debug turned on.

This caught a couple of places where we were missing schemas, so add
those in too.

Change-Id: I1873ddd592d33fe4e64210a2e08aa9b937d61ab8
Signed-off-by: Austin Schuh <austin.schuh@bluerivertech.com>
diff --git a/aos/logging/BUILD b/aos/logging/BUILD
index cf0c370..30fd0d1 100644
--- a/aos/logging/BUILD
+++ b/aos/logging/BUILD
@@ -1,4 +1,5 @@
 load("@com_github_google_flatbuffers//:build_defs.bzl", "flatbuffer_cc_library")
+load("//aos:flatbuffers.bzl", "cc_static_flatbuffer")
 
 # The primary client logging interface.
 cc_library(
@@ -95,3 +96,10 @@
     target_compatible_with = ["@platforms//os:linux"],
     visibility = ["//visibility:public"],
 )
+
+cc_static_flatbuffer(
+    name = "log_message_schema",
+    function = "aos::logging::LogMessageFbsSchema",
+    target = ":log_message_fbs_reflection_out",
+    visibility = ["//visibility:public"],
+)