Add publish_status and remove_status methods to WebSocketServer (#192)

Relatively simple PR to add support for publishing status messages to
all connected clients, and removing them by list of ids.

[WS
Spec](https://github.com/foxglove/ws-protocol/blob/main/docs/spec.md#remove-status)

[Current Python
implementation](https://github.com/foxglove/ws-protocol/blob/main/python/src/foxglove_websocket/server/__init__.py#L457)

One thing I did here is treat status messages the same as log messages,
in that when the queue is full it will drop older messages from the data
plane queue.

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Co-authored-by: Greg Smith <gasmith@foxglove.dev>