Property 'config' does not exist on type 'FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTypeProviderDefault>'.

### Prerequisites

- [X] I have written a descriptive issue title
- [X] I have searched existing issues to ensure the bug has not already been reported

### Fastify version

^4.24.2"

### Plugin version

^4.2.0

### Node.js version

v18.12.0

### Operating system

macOS

### Operating system version (i.e. 20.04, 11.3, 10)

14.0 (23A344)

### Description

The code structure is created with fastify-cli using typescript template.
```ts
// file: authorization.ts
import { FastifyInstance } from "fastify"

const authorization = async (fastify:FastifyInstance, opts) => {
const { httpErrors, config } = fastify // got error: Property 'config' does not exist on type 'FastifyInstance, FastifyBaseLogger, FastifyTypeProviderDefault>'.
}
```

### Steps to Reproduce

The code structure is created with fastify-cli using typescript template.
maybe the error is cause by `@fastify/env` not extending the fastify instance object like this
```ts
declare module 'fastify' {
export interface FastifyInstance {
someSupport(): string;
}
}
```

My code
```ts
// file: authorization.ts
import { FastifyInstance } from "fastify"

const authorization = async (fastify:FastifyInstance, opts) => {
const { httpErrors, config } = fastify // got error: Property 'config' does not exist on type 'FastifyInstance, FastifyBaseLogger, FastifyTypeProviderDefault>'.
}
```

I already registerred the "@fastify/env"

```ts
// file: app.ts
import Env from "@fastify/env"
const app: FastifyPluginAsync = async (
fastify,
opts
): Promise => {
// Place here your custom code!
// env
void fastify.register(Env, {
schema: S.object()
.prop("NODE_ENV", S.string().default("development"))
.valueOf(),
})

```

is it bec

### Expected Behavior

_No response_