[Lua] Apply Namer to Lua (#7171)

* Apply Namer to Lua bfbs code gen

* refactor namer into IdlNamer to keep idl includes separate

* remove commented out code

* added bfbs_namer

* remove Enum case

* add to bazel

src/bfbs_namer.h

@@ -0,0 +1,43 @@
+#ifndef FLATBUFFERS_BFBS_NAMER
+#define FLATBUFFERS_BFBS_NAMER
+
+#include "flatbuffers/reflection.h"
+#include "namer.h"
+
+namespace flatbuffers {
+
+// Provides Namer capabilities to types defined in the flatbuffers reflection.
+class BfbsNamer : public Namer {
+ public:
+  explicit BfbsNamer(Config config, std::set<std::string> keywords)
+      : Namer(config, std::move(keywords)) {}
+
+  using Namer::Constant;
+  using Namer::Denamespace;
+  using Namer::Directories;
+  using Namer::Field;
+  using Namer::File;
+  using Namer::Function;
+  using Namer::Method;
+  using Namer::Namespace;
+  using Namer::NamespacedType;
+  using Namer::ObjectType;
+  using Namer::Type;
+  using Namer::Variable;
+  using Namer::Variant;
+
+  template<typename T>
+  std::string Denamespace(T t, std::string &namespace_prefix,
+                          const char delimiter = '.') const {
+    return Namer::Denamespace(t->name()->c_str(), namespace_prefix, delimiter);
+  }
+
+  template<typename T>
+  std::string Denamespace(T t, const char delimiter = '.') const {
+    return Namer::Denamespace(t->name()->c_str(), delimiter);
+  }
+};
+
+}  // namespace flatbuffers
+
+#endif  // FLATBUFFERS_BFBS_NAMER