Michael Bolin 3f40fbc0a8 chore: improve serialization of ServerNotification (#3193)
This PR introduces introduces a new
`OutgoingMessage::AppServerNotification` variant that is designed to
wrap a `ServerNotification`, which makes the serialization more
straightforward compared to
`OutgoingMessage::Notification(OutgoingNotification)`. We still use the
latter for serializing an `Event` as a `JSONRPCMessage::Notification`,
but I will try to get away from that in the near future.

With this change, now the generated TypeScript type for
`ServerNotification` is:

```typescript
export type ServerNotification =
  | { "method": "authStatusChange", "params": AuthStatusChangeNotification }
  | { "method": "loginChatGptComplete", "params": LoginChatGptCompleteNotification };
```

whereas before it was:

```typescript
export type ServerNotification =
  | { type: "auth_status_change"; data: AuthStatusChangeNotification }
  | { type: "login_chat_gpt_complete"; data: LoginChatGptCompleteNotification };
```

Once the `Event`s are migrated to the `ServerNotification` enum in Rust,
it should be considerably easier to work with notifications on the
TypeScript side, as it will be possible to `switch (message.method)` and
check for exhaustiveness.

Though we will probably need to introduce:

```typescript
export type ServerMessage = ServerRequest | ServerNotification;
```

and then we still need to group all of the `ServerResponse` types
together, as well.
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