feat(types): auto generate api types with openapi specs (#443)

BREAKING CHANGE: The TypeScript types for the PayPal APIs have changed. 
Now they are auto generated based on the Open API 3.0 specs.

package.json

@@ -21,7 +21,10 @@
         "test:e2e:debug": "PWDEBUG=1 playwright test --project=\"chromium\"",
         "test:e2e:start": "node e2e-tests/http-server.js",
         "typecheck": "tsc --noEmit",
-        "validate": "npm run check-node-version && npm run format:check && npm run typecheck && npm run build && npm run lint && npm test -- --coverage --watch=false && npm run test:bundle -- --watch=false"
+        "validate": "npm run check-node-version && npm run format:check && npm run typecheck && npm run build && npm run lint && npm test -- --coverage --watch=false && npm run test:bundle -- --watch=false",
+        "openapi": "npm run openapi-orders && npm run openapi-subscriptions",
+        "openapi-orders": "openapi-typescript node_modules/@paypal/paypal-rest-api-specifications/openapi/checkout_orders_v2.json -o types/apis/openapi/checkout_orders_v2.d.ts",
+        "openapi-subscriptions": "openapi-typescript node_modules/@paypal/paypal-rest-api-specifications/openapi/billing_subscriptions_v1.json -o types/apis/openapi/billing_subscriptions_v1.d.ts"
     },
     "files": [
         "dist",
@@ -46,6 +49,7 @@
     "devDependencies": {
         "@commitlint/cli": "18.4.3",
         "@commitlint/config-conventional": "18.4.3",
+        "@paypal/paypal-rest-api-specifications": "^1.0.0",
         "@playwright/test": "^1.40.0",
         "@rollup/plugin-commonjs": "25.0.7",
         "@rollup/plugin-node-resolve": "15.2.3",
@@ -62,6 +66,7 @@
         "husky": "8.0.3",
         "jsdom": "^23.0.0",
         "lint-staged": "15.1.0",
+        "openapi-typescript": "^6.7.2",
         "prettier": "3.1.0",
         "rollup": "4.6.0",
         "semver": "7.5.4",