Add warning that this package is deprecated

Author: JoshMock

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@elastic/elasticsearch-serverless",
-  "version": "0.9.0+20231031",
+  "version": "0.9.1+20231031",
   "description": "The official Node.js Elastic client for the Elasticsearch Serverless service.",
   "main": "./index.js",
   "types": "index.d.ts",

src/client.ts

@@ -48,6 +48,8 @@ import API from './api'
 import packageJson from '../package.json'
 import transportPackageJson from '@elastic/transport/package.json'
 
+console.warn(`This package is deprecated and no longer supported. All serverless-specific Elasticsearch functionality has been merged back into @elastic/elasticsearch.`)
+
 const kChild = Symbol('elasticsearchjs-child')
 const kInitialOptions = Symbol('elasticsearchjs-initial-options')
 let clientVersion: string = packageJson.version