chore: useful reth / alloy type conversions

[merklefruit]

The following traits should be implemented in alloy to remove manual casting functions in op-rs:

• impl From<reth::primitives::SealedBlock> for alloy::rpc::types::Block
• impl From<reth::primitives::SealedHeader> for alloy::consensus::Header
• impl From<reth::primitives::TransactionSigned> for Option<alloy::consensus::TxEnvelope> (TryFrom is fine too)
• impl From<reth::rpc::types::Block> for alloy::rpc::types::Block<TxEnvelope>

[GrapeBaBa]

@merklefruit let me try

[GrapeBaBa]

@merklefruit When I looked alloy, it did't depend on reth-primitives and i thought it should not, so i am confused does this issue make sense?

[merklefruit]

Yeah that's the issue. We can just wait to see if Reth is interested in using Alloy types for this and then it will be possible.
For now this is blocked - but would like to keep this open just to remember which type conversions we need eventually.