Feat(fulfillment): service provider registration + fulfillment management (#6524)

**What**
- Create the fulfillment manual package with a first iteration API 
- Create a new `AbstractFulfillmentProviderService` and `IFulfillmentProvider`
- Modify the module service interface to add new methods to manipulate the fulfillment and the communication with the external provider
  - create (no bulk)
  - cancel (no bulk)
  - update (no bulk)
  - list
  - listAndCount
  - retrieve
- Add new methods to the service provider service to include communication with the third party provider
  - get options
  - create
  - cancel
  - validate data
  - validate option
- Update/create interfaces and DTO's
- fix repository serializer to allow non entity to be passed without throwing
- split module tests into multiple files to simplify navigation
- Add integration tests to validate fulfillments manipulation and external provider loading + communication

FIXES CORE-1729
FIXES CORE-1785
FIXES CORE-1784
FIXES CORE-1766

packages/fulfillment-manual/package.json

@@ -0,0 +1,40 @@
+{
+  "name": "@medusajs/fulfillment-manual",
+  "version": "0.0.1",
+  "description": "Manual fulfillment for Medusa",
+  "main": "dist/index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/medusajs/medusa",
+    "directory": "packages/fulfillment-manual"
+  },
+  "files": [
+    "dist"
+  ],
+  "engines": {
+    "node": ">=16"
+  },
+  "author": "Medusa",
+  "license": "MIT",
+  "scripts": {
+    "prepublishOnly": "cross-env NODE_ENV=production tsc --build",
+    "test": "jest --passWithNoTests src",
+    "build": "rimraf dist && tsc -p ./tsconfig.json",
+    "watch": "tsc --watch"
+  },
+  "devDependencies": {
+    "cross-env": "^5.2.1",
+    "jest": "^25.5.4",
+    "rimraf": "^5.0.1",
+    "typescript": "^4.9.5"
+  },
+  "dependencies": {
+    "@medusajs/utils": "^1.11.3",
+    "body-parser": "^1.19.0",
+    "express": "^4.17.1"
+  },
+  "keywords": [
+    "medusa-plugin",
+    "medusa-plugin-fulfillment"
+  ]
+}