C++: mini_reflect: Add DefaultTypeTable (#4614)

* mini_reflect: Add DefaultTypeTable

Currently it's very easy to make a mistake when it comes to
instantiating the TypeTable to print a buffer because it is not type
safe.

This will allow us to write safer cpp code:

flatbuffers::FlatBufferToString(reinterpret_cast<const uint8_t *>(&t),
                                decltype(t)::DefaultTypeTable());

* c++: mini_reflect: update generated code

* Ensure types and names are set for mini_reflect

* c++: mini_refelct: update unit tests with new typed TypeTable

* Adding PR feedback of sylte and naming convention

samples/monster_generated.h

@@ -17,6 +17,12 @@ struct MonsterT;
 struct Weapon;
 struct WeaponT;
 
+inline flatbuffers::TypeTable *Vec3TypeTable();
+
+inline flatbuffers::TypeTable *MonsterTypeTable();
+
+inline flatbuffers::TypeTable *WeaponTypeTable();
+
 enum Color {
   Color_Red = 0,
   Color_Green = 1,
@@ -185,6 +191,9 @@ struct MonsterT : public flatbuffers::NativeTable {
 
 struct Monster FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
   typedef MonsterT NativeTableType;
+  static flatbuffers::TypeTable *MiniReflectTypeTable() {
+    return MonsterTypeTable();
+  }
   enum {
     VT_POS = 4,
     VT_MANA = 6,
@@ -384,6 +393,9 @@ struct WeaponT : public flatbuffers::NativeTable {
 
 struct Weapon FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
   typedef WeaponT NativeTableType;
+  static flatbuffers::TypeTable *MiniReflectTypeTable() {
+    return WeaponTypeTable();
+  }
   enum {
     VT_NAME = 4,
     VT_DAMAGE = 6
@@ -603,12 +615,6 @@ inline void EquipmentUnion::Reset() {
   type = Equipment_NONE;
 }
 
-inline flatbuffers::TypeTable *Vec3TypeTable();
-
-inline flatbuffers::TypeTable *MonsterTypeTable();
-
-inline flatbuffers::TypeTable *WeaponTypeTable();
-
 inline flatbuffers::TypeTable *ColorTypeTable() {
   static flatbuffers::TypeCode type_codes[] = {
     { flatbuffers::ET_CHAR, 0, 0 },