chore: remove all reth types

[merklefruit]

• We can get away with alloy::consensus::PooledTransaction instead of reth_primitives::TransactionSigned
• Similarly, BlockBody, SealedBlock, SealedHeader from reth can all be avoided with alloy::consensus::Block!

We don't have any reth types left after this. Upstack PR #753 removes them from Cargo.toml!

[merklefruit]

📚 $\text{Stack Overview}$

Pulls submitted in this stack:

• chore(sidecar): rm unused dependencies #753
• chore: remove all reth types #752 👈
• unstable

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[mempirate]

They seem to have some sealed types: https://docs.rs/alloy/latest/alloy/?search=Sealed

[merklefruit]

They seem to have some sealed types: docs.rs/alloy/latest/alloy?search=Sealed

taking a look :)

edit: yeah it was pretty simple, we can just use alloy::consensus::Block!

[merklefruit]

Tested in the devnet, and was able to self-build blocks.