Add upcoming end-of-support message in postinstall (#4599)

Author: trivikr

.changes/next-release/feature-Support-e84edb28.json

@@ -0,0 +1,5 @@
+{
+  "type": "feature",
+  "category": "Support",
+  "description": "Add upcoming end-of-support message in postinstall"
+}

package.json

@@ -145,6 +145,7 @@
     "translate-api-test": "mocha scripts/lib/translate-api.spec.js",
     "typings-generator-test": "mocha scripts/lib/prune-shapes.spec.js",
     "helper-test": "mocha scripts/lib/test-helper.spec.js",
-    "csm-functional-test": "mocha test/publisher/functional_test"
+    "csm-functional-test": "mocha test/publisher/functional_test",
+    "postinstall": "node scripts/warn-maintenance-mode.js"
   }
 }

scripts/warn-maintenance-mode.js

@@ -0,0 +1,14 @@
+console.warn(
+  '\n╔═════════════════════════════════════════════════╗'
++ '\n║ The AWS SDK for JavaScript (v2) will reach      ║'
++ '\n║ -> maintenance mode on September 8, 2024.       ║'
++ '\n║ -> end-of-support on September 8, 2025.         ║'
++ '\n║                                                 ║'
++ '\n║ To continue receiving updates to AWS services,  ║'
++ '\n║ bug fixes, and security updates please upgrade  ║'
++ '\n║ to AWS SDK for JavaScript (v3).                 ║'
++ '\n║                                                 ║'
++ '\n║ More info: https://a.co/cUPnyil                 ║'
++ '\n╚═════════════════════════════════════════════════╝'
++ '\n'
+);