feat: add query emitter with round-trip support for SET and SELECT

Author: renecannao

Makefile.new

@@ -25,7 +25,8 @@ TEST_SRCS = $(TEST_DIR)/test_main.cpp \
             $(TEST_DIR)/test_classifier.cpp \
             $(TEST_DIR)/test_expression.cpp \
             $(TEST_DIR)/test_set.cpp \
-            $(TEST_DIR)/test_select.cpp
+            $(TEST_DIR)/test_select.cpp \
+            $(TEST_DIR)/test_emitter.cpp
 TEST_OBJS = $(TEST_SRCS:.cpp=.o)
 TEST_TARGET = $(PROJECT_ROOT)/run_tests