feat(cli): add bridge cmd to submit withdrawal events

[SuperFluffy]

Summary

Adds a subcommand to submit previously collected withdrawal events.

Background

#1261 provides a subcommand to listen to and collect withdrawal events that come form a rollup's astria contracts. This patch now provides the ability to also submit the events.

Changes

• Added a bridge submit-withdrawals subcommand to astria-cli
• Renamed bridge collect-withdrawal-events to bridge collect-withdrawals
• Adjusted the object written and read to be a json object rollup_height -> [actions].

Testing

TBD