Remove total difficulty from rpc

[mattsse]

Describe the feature

total difficulty has been deprecated ethereum/execution-apis#570

and we can start removing it, starting with rpc:

reth/crates/rpc/rpc-eth-api/src/helpers/block.rs

Lines 67 to 76 in 1602bae

	let mut total_difficulty = self
	.provider()
	.header_td_by_number(block.number())
	.map_err(Self::Error::from_eth_err)?;
	if total_difficulty.is_none() {
	// if we failed to find td after we successfully loaded the block, try again using
	// the hash this only matters if the chain is currently transitioning the merge block and there's a reorg: <https://github.com/paradigmxyz/reth/issues/10941>
	total_difficulty =
	self.provider().header_td(&block.hash()).map_err(Self::Error::from_eth_err)?;
	}

TODO

• simplify rpc block functions by removing total difficulty

Additional context

No response

[mvares]

@mattsse here needs more something? If not, close this