feat(providers): Upstream Transaction Conversion Util

[refcell]

Description

#15 introduces the InMemoryChainProvider in the kona-providers crate.

Since the Chain state provides blocks and its associated transactions to commit to the internal provider, the types are coerced into kona-derive's TxEnvelope type.

This ticket is to add a utility into reth's rpc-types-compat crate, following discussion here to handle these type conversions.

[refcell]

Updated the issue to make it clear that this should live in reth's rpc-types-compat crate and not elsewhere