Refactor(medusa): Create a BaseEntity and SoftDeletableEntity base class for common columns (#1315)

* refactor(medusa): Move some column to a base entity to make it easier to add new models without forgetting some columns

* styles(medusa): Cleanup models

* fix(medusa): typings due to model typings update

* feat(medusa): Cleanup models

* fix(medusa): A model must not return the generateId as part of the entity

* fix(medusa): Plugin integration snapshot

* fix(medusa): Typings from discount-rule-migration scripts

* refactor(medusa): Introduct BaseEntity/SoftDeletableEntity that the entity extends

* styles(medusa): Fix models linting

* test(medusa): Fix integration plugin tests

* feat(medusa): Create generateEntityId standalong function utility and update config to properly supprt ts spec files

* feat(medusa): Update entities to use the new utils to generate and apply the id

* test(medusa): Fix test suits

* feat(medusa): Improve generateEntityId utility

packages/medusa/tsconfig.spec.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "include": [
+    "./src/**/*",
+    "index.d.ts",
+    "./src/**/__tests__",
+    "./src/**/__mocks__"
+  ],
+  "exclude": ["node_modules"]
+}