[breaking-change] Improve ping/pong logic

[SozinM]

This PR contains breaking changes!

1. Now when websocket connection is closed via cancel token we explicitly send Closing frame.
2. Cli params changes:
   --flashblock-builder-ws-reconnect-ms was changed, now it consists of 2 params:
   --flashblock-builder-ws-initial-reconnect-ms and --flashblock-builder-ws-max-reconnect-ms that are used in explonential backoff with multiplier 1.5 (timeout increased by 50% every unsuccessful reconnections and reset on successful connection)
3. Cli params added:
   --flashblock-builder-ws-ping-interval-ms - how often send pings
   --flashblock-builder-ws-pong-timeout-ms - timeout for pong. If we haven't receive pong for ping that we send for timeout - close connection.
4. Now we send proper data (uuid v7) in pings and expect correct pongs.

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
rollup-boost	Ignored	Preview		Oct 16, 2025 10:22am

[avalonche]

does it have any backwards compatibility issues?

[akundaz]

Have you looked at the https://github.com/Xuanwo/backon crate? It's more ergonomic and seems to be actively maintained

[avalonche]

would be good to add integration tests