core/odin: Added new file tag syntax as token. parse_file stores a list of tags that the file tag parser can use later.

core/odin/ast/ast.odin

@@ -69,6 +69,7 @@ File :: struct {
 	fullpath: string,
 	src:      string,
 
+	tags: [dynamic]tokenizer.Token,
 	docs: ^Comment_Group,
 
 	pkg_decl:  ^Package_Decl,