Wrap types in namespace for --ts-flat-files and --gen-all (#7451)

* Wrap types in namespace for --ts-flat-files and --gen-all

* Fixes for escaping object types

* Added to generate_code

tests/flatc/bar/bar_with_ns.fbs

@@ -0,0 +1,14 @@
+include "baz/baz_with_ns.fbs";
+include "baz/baz.fbs";
+
+namespace bar;
+
+table Bar {
+  baz:baz.Baz;
+  baz2:Baz;
+  foo:Foo;
+}
+
+table Foo {
+  a:int;
+}

tests/flatc/bar/baz/baz_with_ns.fbs

@@ -0,0 +1,8 @@
+namespace baz;
+
+enum Baz : short {
+  None = 0,
+  Red,
+  Green,
+  Blue,
+}