Add a wrapper around flatbuffers::TypeTable

So I can implement it on top of a Schema too.

Change-Id: I56502593e302c186cf48d3e2b42233a48202176d
diff --git a/aos/BUILD b/aos/BUILD
index 790f845..96c5b3d 100644
--- a/aos/BUILD
+++ b/aos/BUILD
@@ -337,6 +337,7 @@
     target_compatible_with = ["@platforms//os:linux"],
     deps = [
         "@com_github_google_flatbuffers//:flatbuffers",
+        "@com_github_google_glog//:glog",
     ],
 )