same as

https://github.com/alloy-rs/examples/blob/9e5745a75c1feb4e4663760807d17eb443bf0893/examples/transactions/examples/send_eip4844_transaction.rs

but with simplecoder

https://github.com/alloy-rs/alloy/blob/367478ffa892053d920ac068f29126a3eed84cf6/crates/eips/src/eip4844/builder.rs#L411-L411

this should use sendraw tx for now until we have this properly supported in txrequest