Add postinstall and postupdate scripts for regions.json retrieval; include region property in ContentstackConfig interface

Author: nadeem-cs

package.json

@@ -44,7 +44,9 @@
     "pre-commit": "npm run lint && husky install && husky && chmod +x .husky/pre-commit && ./.husky/pre-commit",
     "prepush": "npm run test:unit",
     "generate:docs": "node_modules/.bin/jsdoc --configure .jsdoc.json --readme README.md --verbose",
-    "husky-check": "npx husky && chmod +x .husky/pre-commit"
+    "husky-check": "npx husky && chmod +x .husky/pre-commit",
+    "postinstall": "curl -s --max-time 30 --fail https://artifacts.contentstack.com/regions.json -o lib/assets/regions.json || echo 'Warning: Failed to download regions.json, using existing file if available'",
+    "postupdate": "curl -s --max-time 30 --fail https://artifacts.contentstack.com/regions.json -o lib/assets/regions.json || echo 'Warning: Failed to download regions.json, using existing file if available'"
   },
   "engines": {
     "node": ">=8.0.0"

types/contentstackClient.d.ts

@@ -31,6 +31,7 @@ export interface ContentstackToken {
 export interface ContentstackConfig extends AxiosRequestConfig, ContentstackToken {
     proxy?: ProxyConfig | false
     endpoint?: string
+    region?: string
     host?: string
     timeout?: number
     maxRequests?: number