Converted SQL file into multiple files. (apache#1401)

Converted SQL file into multiple files.

This pull request is aimed at improving the overall quality of our SQL codebase
by converting the main SQL (age-x.x.x.sql) file into multiple smaller files in the
sql directory. The primary goal is to enhance code readability, maintainability,
and organization for the benefit of the development team.

.gitignore

@@ -2,6 +2,7 @@
 *.so
 .gitignore
 build.sh
+age--*.*.*.sql
 .idea
 .deps
 .DS_Store

Makefile

@@ -17,6 +17,7 @@
 
 MODULE_big = age
 
+age_sql = age--1.4.0.sql
 
 
 OBJS = src/backend/age.o \
@@ -75,7 +76,12 @@ OBJS = src/backend/age.o \
 
 EXTENSION = age
 
-DATA = age--1.4.0.sql
+#SQLS = $(sort ($(wildcard sql/*.sql)))
+SQLS := $(shell cat sql/sql_files)
+SQLS := $(addprefix sql/,$(SQLS)) 
+SQLS := $(addsuffix .sql,$(SQLS)) 
+
+DATA_built = $(age_sql)
 
 # sorted in dependency order
 REGRESS = scan \
@@ -111,7 +117,7 @@ ag_regress_dir = $(srcdir)/regress
 REGRESS_OPTS = --load-extension=age --inputdir=$(ag_regress_dir) --outputdir=$(ag_regress_dir) --temp-instance=$(ag_regress_dir)/instance --port=61958 --encoding=UTF-8 --temp-config $(ag_regress_dir)/age_regression.conf
 
 ag_regress_out = instance/ log/ results/ regression.*
-EXTRA_CLEAN = $(addprefix $(ag_regress_dir)/, $(ag_regress_out)) src/backend/parser/cypher_gram.c src/include/parser/cypher_gram_def.h
+EXTRA_CLEAN = $(addprefix $(ag_regress_dir)/, $(ag_regress_out)) src/backend/parser/cypher_gram.c src/include/parser/cypher_gram_def.h $(age_sql)
 
 ag_include_dir = $(srcdir)/src/include
 PG_CPPFLAGS = -I$(ag_include_dir) -I$(ag_include_dir)/parser
@@ -127,4 +133,7 @@ src/backend/parser/cypher_gram.c: BISONFLAGS += --defines=src/include/parser/cyp
 src/backend/parser/cypher_parser.o: src/backend/parser/cypher_gram.c
 src/backend/parser/cypher_keywords.o: src/backend/parser/cypher_gram.c
 
+$(age_sql):
+	@cat $(SQLS) > $@
+
 src/backend/parser/ag_scanner.c: FLEX_NO_BACKUP=yes