feat(api): add subscription server and client services and interfaces (#1470)

* feat(api): add subscription server and client services and interfaces

* fix(api): linter issues

* feat(models): add subscription invitations

* feat(api): add subscriptions invitation operations on server side

* fix(api): linter issues

packages/api/package.json

@@ -22,12 +22,14 @@
     "prebuild": "yarn clean",
     "build": "tsc -p tsconfig.json",
     "lint": "eslint . --ext .ts",
+    "lint:fix": "eslint . --ext .ts --fix",
     "test": "jest spec --coverage"
   },
   "devDependencies": {
     "@types/jest": "^28.1.5",
     "@types/lodash": "^4.14.182",
     "@typescript-eslint/eslint-plugin": "^5.30.0",
+    "eslint": "^8.23.0",
     "eslint-plugin-prettier": "*",
     "jest": "^28.1.2",
     "ts-jest": "^28.0.5"