Add reconnectable websocket manager

[USEONGEE]

Closes #191

Title

Add ReconnectableWebsocketManager with automatic reconnection, subscription restoration, and persistent app-level ping

Summary

This PR introduces ReconnectableWebsocketManager, extending WebsocketManager to automatically reconnect on disconnection and restore subscriptions after the connection is re-established. It also ensures the application-level ping continues across reconnects.

Note

This PR does not modify the original WebsocketManager implementation; all changes are encapsulated in the new ReconnectableWebsocketManager

Changes

• ReconnectableWebsocketManager
  • Reconnection loop with configurable ping_timeout, ping_interval, and reconnect_interval.
  • on_close / on_error trigger reconnection unless stop_event is set.
  • _reconnect() re-queues previously active subscriptions; on_open() drains the queue and re-subscribes.
• App-level ping persistence
  • Override send_ping() so the ping thread does not terminate when the socket drops; it skips sends while disconnected and resumes automatically after reconnect.
  • Ensure the ping thread is started initially and restarted if needed via _start_ping_sender().
• Minor: log messages reflect the actual reconnect_interval.

Why

• The original WebsocketManager does not provide reconnection or subscription restoration. This PR improves resilience under network instability and server restarts, and maintains application-level heartbeats across reconnects.

Out of Scope

• Thread-safety/locking for shared structures (queued_subscriptions, active_subscriptions, subscription_id_counter).
• Actor/queue refactor and async-specific APIs.

[USEONGEE]

In the WebsocketManager constructor, the ws_url variable is not stored as an instance field (no self.ws_url).
In the newly implemented ReconnectableWebsocketManager, the run method declares ws_url as a local variable.
This inconsistency could lead to confusion in the future, so I would like to store ws_url as an instance field in WebsocketManager

[rafaelcapucho]

I'm having hard time not being able to recover from lost connection too.

The websocket.WebSocketApp(..) Is so deep that it is hard to patch it, to add the on_error= call.

Also we can't catch the exception in any way, like as in:

def main():
    #app = HyperLiquidApp()
    #app.run()

    while run:
        try:
            address, info, exchange = utils.setup(constants.MAINNET_API_URL, skip_ws=False)

        except WebSocketException:
            continue

So one alternative should be offered by the this library. I'm waiting to a solution, thank you !!