feat(chore): remove support for node v14,v12 (#162)

Both node v12 and node v14 have reached their end of life

BREAKING CHANGE:- End of life of node v14 and node v12

GH-161

Author: RaghavaroraSF

package-lock.json

@@ -10,7 +10,7 @@
   ],
   "main": "index.js",
   "engines": {
-    "node": "12 || 14 || 16 || 17"
+    "node": "16 || 17 || 18"
   },
   "scripts": {
     "build": "npm run clean && lb-tsc",