[fuzzer] Adds code generation target. (#8795)

* adds code generation fuzzer target.

* add buffer verification

* add table verification in codegen fuzzer

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Co-authored-by: Björn Harrtell <bjornharrtell@users.noreply.github.com>

src/idl_gen_ts.cpp

@@ -47,7 +47,7 @@ struct NsDefinition {
   std::string path;
   std::string filepath;
   std::string symbolic_name;
-  const Namespace* ns;
+  const Namespace* ns = nullptr;
   std::map<std::string, const Definition*> definitions;
 };
 
@@ -258,7 +258,7 @@ class TsGenerator : public BaseGenerator {
       nsDef.path = root;
       nsDef.symbolic_name = file_name_;
       nsDef.filepath = path_ + file_name_ + ".ts";
-      nsDef.ns = new Namespace();
+      nsDef.ns = parser_.empty_namespace_;
       ns_defs_[nsDef.path] = nsDef;
     }