Due to custom header usage, only `eth_subscribe` method was returning the new header format in raw format, while other part were using RpcConvert to convert headers.
Make `eth_subscribe` newHeads to return the `inner` field (original eth header) instead.
No need to give malfunctioning feature by default. Issue #15 affects
StoragesTrie, AccountsTrie table which is used only for state root and
proof generation.
Also clearing the table does not affect any other parts of reth node.
Meanwhile, add --experimental-eth-get-proof flag to enable eth_getProof
forcefully.
For simplicity, we use with_pow() + pseudo peer that connects to reth itself, so that it can support 1. StateFetcher via NetworkState 2. Block announcement (which requires with_pow()).
For block announcement, another way was using ImportService like before, or calling engine_api. But for simplicitiy, for now we just publish from pseudo peer like pre-PoS, hence with_pow().
