lang: codegen: redesign codegen to use a stack-based state machine

lang/codegen/try.c

@@ -0,0 +1,12 @@
+#include "codegen.h"
+
+enum ivy_status try_code_generator(struct ivy_codegen *gen, struct ivy_ast_node *node)
+{
+	return IVY_ERR_NOT_SUPPORTED;
+}
+
+enum ivy_status try_catch_code_generator(
+	struct ivy_codegen *gen, struct ivy_ast_node *node)
+{
+	return IVY_ERR_NOT_SUPPORTED;
+}