### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

I would like to request extending `sns_listener` with an ability to understand `email-json` next to `email` protocol.

### 🧑‍💻 Implementation

1. check if protocol is `email` or `email-json`
2. for email json interpret body/message as json

### Anything else?

_No response_
subs = [
            message_to_subscriber(
                message_id,
                message,
                topic_arn,
                req_data,
                headers,
                subscription_arn,
                skip_checks,
                sns_backend,
                subscriber,
                subscriptions,
                message_attributes,
            )
            for subscriber in list(subscriptions)
        ]
        if subs:
            await asyncio.wait(subs)
    asyncio.run(wait_for_messages_sent())
async def message_to_subscriber(
    message_id,
    message,
    topic_arn,