feat(feynman): compute compression ratio on tx data

[Thegaram]

Update rollup fee formula:

rollup_fee(tx) = penalty(tx) * size(encode_eip2718(tx)) * (
	exec_scalar * l1_base_fee + 
	blob_scalar * l1_blob_base_fee
)

penalty(tx) = compression_ratio(tx) < penalty_threshold ? penalty_value : 1

compression_ratio(tx) = size(tx.data) > 0 ? max(size(tx.data) / size(zstd(tx.data)), 1) : U256MAX   // !!

Note:

1. Rollup fee is still multiplied by the full encoded transaction (EIP-2718, or RLP for legacy txs).
2. The compression ratio is computed on tx.data (payload) only, ignoring other tx fields (signature, etc.)
3. Transactions with no payload (i.e. simple ETH transfers) will not be penalized.

[codspeed-hq]

CodSpeed Performance Report

Merging #261 will not alter performance

_{Comparing feat-compute-compression-ratio-on-tx-data (d75bbba) with scroll (77da60f)}

Summary

✅ 77 untouched benchmarks

[greged93]

lgtm!

[frisitano]

Post-merge review - all looks good.