Refactor SQL headers into core/ddl/dml/dql split

- Replace monolithic sql include usage with split headers\n- Add shared write-side internals header used by DML and DQL extensions\n- Update umbrella/database headers and unit test includes\n- Keep build and unit tests green after include graph changes

Author: Pierre-Luc Gagné

lib/include/ds_mysql/database.hpp

@@ -17,7 +17,9 @@
 #include "ds_mysql/database_name.hpp"
 #include "ds_mysql/host_name.hpp"
 #include "ds_mysql/port_number.hpp"
-#include "ds_mysql/sql.hpp"
+#include "ds_mysql/sql_ddl.hpp"
+#include "ds_mysql/sql_dml.hpp"
+#include "ds_mysql/sql_dql.hpp"
 
 namespace ds_mysql {
 

lib/include/ds_mysql/ds_mysql.hpp

@@ -13,5 +13,7 @@
 
 #include "ds_mysql/database.hpp"
 #include "ds_mysql/metadata.hpp"
-#include "ds_mysql/sql.hpp"
+#include "ds_mysql/sql_ddl.hpp"
+#include "ds_mysql/sql_dml.hpp"
+#include "ds_mysql/sql_dql.hpp"
 #include "ds_mysql/version.hpp"