refactor(medusa): move repository specs into its own folder (#2952)

**What:**

Introduces a new folder under which repository specs will be placed. 

Why:

We don't currently have a good place to test ORM logic or custom queries against the database. The repository folder tests are a place for just exactly that. 

How:

Creates an internal package similar to other integration tests - api and plugins. 

CORE-965

integration-tests/repositories/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "integration-tests-repositories",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "private": true,
+  "scripts": {
+    "test": "jest --silent=false --runInBand --bail --detectOpenHandles --forceExit"
+  },
+  "dependencies": {
+    "@medusajs/medusa": "*",
+    "medusa-interfaces": "*",
+    "typeorm": "^0.2.31"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.12.10",
+    "@babel/core": "^7.12.10",
+    "@babel/node": "^7.12.10",
+    "babel-preset-medusa-package": "*",
+    "jest": "^26.6.3"
+  }
+}