feat: log RPC calls

[luisschwab]

Log RPC requests and responses if the log level is trace or higher.

cc @erickcestari

[vatsalkeshav]

Hi
I'd like to work on this. I think this'd add trace for rpc request and response in json_rpc_request fn in crates/floresta-node/src/json_rpc/server.rs at 3 output points in pink

Should this debug be trace also-as it logs input? debug!("Received JSON-RPC request: {req:?}");