refactor: reorganize project by component

internal/environment/migrations/007_runtime_binding_version.sql

@@ -0,0 +1,7 @@
+ALTER TABLE runtime_instance
+    ADD COLUMN binding_version bigint CHECK (binding_version > 0);
+
+UPDATE runtime_instance runtime
+SET binding_version = binding.version
+FROM environment_binding binding
+WHERE runtime.binding_id = binding.id;