Make the websocket connection timeout configurable and add to the context

[tcheeric]

In the nostr.connection.impl.ConnectionImpl class.

Currently, it is set to 1000 ms. This might be a good default value, but we should allow clients to change it.

The value can be added in the app.properties, then added to the context. (All config attributes can be packaged as a Map<String, String> attribute in the context).