moved session to namespace query and move basic_schema::initialize to session constructor

test/orm/CMakeLists.txt

@@ -13,7 +13,7 @@ add_executable(OrmTests
   backend/test_result_reader.hpp
   backend/test_statement.cpp
   backend/test_statement.hpp
-  orm/SessionQueryBuilderTest.cpp
+  query/ColumnExpressionTest.cpp
   query/ColumnGeneratorTest.cpp
   query/CriteriaTests.cpp
   query/GeneratorTests.cpp
@@ -23,6 +23,7 @@ add_executable(OrmTests
   query/QueryFixture.hpp
   query/QueryTest.cpp
   query/SchemaTest.cpp
+  query/SessionQueryBuilderTest.cpp
   query/TableColumnTest.cpp
   sql/ColumnTest.cpp
   sql/ConnectionPoolFixture.hpp
@@ -31,7 +32,6 @@ add_executable(OrmTests
   sql/StatementCacheTest.cpp
   utils/auto_reset_event.cpp
   utils/auto_reset_event.hpp
-  query/ColumnExpressionTest.cpp
 )
 
 target_link_libraries(OrmTests matador-orm matador-core Catch2::Catch2WithMain)