feat!: type auto-generation (#6657)

Types are now auto-generated by default.

You can opt-out of this behavior by setting:
```ts
buildConfig({
  // Rest of config
  typescript: {
    autoGenerate: false
  },
})
```

packages/next/src/utilities/getPayloadHMR.ts

@@ -2,6 +2,7 @@ import type { GeneratedTypes, Payload } from 'payload'
 import type { InitOptions, SanitizedConfig } from 'payload/config'
 
 import { BasePayload } from 'payload'
+import { generateTypes } from 'payload/bin'
 import WebSocket from 'ws'
 
 let cached: {
@@ -36,6 +37,11 @@ export const reload = async (config: SanitizedConfig, payload: Payload): Promise
 
   // TODO: support HMR for other props in the future (see payload/src/index init()) hat may change on Payload singleton
 
+  // Generate types
+  if (config.typescript.autoGenerate !== false) {
+    void generateTypes(config, { log: false })
+  }
+
   await payload.db.init()
   if (payload.db.connect) {
     await payload.db.connect({ hotReload: true })