[xrpc-server] Quiet websocket subscriptions time out

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Describe the bug

I have a cursorless subscription that doesn't have a high throughput like the firehose and as a result can go quiet for several minutes at a time. During that time the websocket closes meaning I have to reconnect, losing out on events. I'd like to not have to implement a cursor, nor do I really like having to constantly reconnect on closing. I would much rather the websocket ping/pong be properly handled.

To Reproduce

Steps to reproduce the behavior:

1. Create a subscription XRPC endpoint using the package. Consider hooking it up to something that produces an event every 2-5 minutes or so.
2. Create a client that subscribes to the endpoint. Monitor for closing and messages.

It's more likely that the socket will close before the message comes through.

Expected behavior

The xrpc-server package should be sending pings every 20 seconds or so to connected clients.

Details

• Operating system: 6.12.1-arch1-1
• Node version: 23.4.0