refactor(postgres) improve postgres code base (#20808)

Co-authored-by: cirospaciari <6379399+cirospaciari@users.noreply.github.com>

src/sql/postgres/ConnectionFlags.zig

@@ -0,0 +1,7 @@
+pub const ConnectionFlags = packed struct {
+    is_ready_for_query: bool = false,
+    is_processing_data: bool = false,
+    use_unnamed_prepared_statements: bool = false,
+};
+
+// @sortImports