feat(network-primitives): add blob_versioned_hashes to TransactionBuilder4844

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Summary

Adds blob_versioned_hashes getter/setter/builder methods to the TransactionBuilder4844 trait.

TransactionRequest already stores blob_versioned_hashes as a field and uses it extensively
for EIP-4844 type detection, validation, and tx building. However, the TransactionBuilder4844
trait only exposes max_fee_per_blob_gas and blob_sidecar — there is no way for generic code
(T: TransactionBuilder4844) to read or write blob versioned hashes.

This is needed by downstream consumers (e.g. Foundry) that have functions generic over
T: TransactionBuilder4844 and need to populate EVM TxEnv.blob_hashes from the transaction
request.

Changes

• Add blob_versioned_hashes(&self) -> Option<&[B256]> (default: None)
• Add set_blob_versioned_hashes(&mut self, Vec<B256>) (default: no-op)
• Add with_blob_versioned_hashes(self, Vec<B256>) -> Self (builder pattern)
• Add WithOtherFields<T> delegation for the new methods
• Implement on TransactionRequest backed by the existing blob_versioned_hashes field

All defaults are no-ops so existing trait implementations are unaffected.

[mablr]

For more context: this is not anymore on the Foundry Cast refactor hotpath. See foundry-rs/foundry#13512.

But I still think it's a nice a "nice-to-have" feat, to add not before Alloy 2.0 and its TransactionBuilder4844 unification #3600

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For more context: this is not anymore on the Foundry Cast refactor hotpath. See foundry-rs/foundry#13512.

But I still think it's a nice a "nice-to-have" feat, to add not before Alloy 2.0 and its TransactionBuilder4844 unification #3600

will note this down since we might have more cases after release