feat: add configurable L2 RPC URL for L1 watcher #4008
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Motivation
To solve the issue "add L2 rpc url to WatcherConfig instead of using a hardcoded one"
Description
This update introduces a new l2_rpc_url option to WatcherOptions, allowing the L1 watcher to connect to a configurable L2 RPC endpoint. Default behavior points to http://localhost:1729, ensuring backward compatibility.
Closes #3696