Implement Web3 namespace RPC handler

[mattsse]

Describe the feature

Add missing Web3Api type and implementation of

reth/crates/net/rpc-api/src/web3.rs

Lines 4 to 15 in c7289bd

	/// Web3 rpc interface.
	#[cfg_attr(not(feature = "client"), rpc(server))]
	#[cfg_attr(feature = "client", rpc(server, client))]
	pub trait Web3Api {
	/// Returns current client version.
	#[method(name = "web3_clientVersion")]
	fn client_version(&self) -> Result<String>;
	/// Returns sha3 of the given data.
	#[method(name = "web3_sha3")]
	fn sha3(&self, input: Bytes) -> Result<H256>;
	}

client_version should be included in NetworkInfo I think

Similar to:

reth/crates/net/rpc/src/admin.rs

Lines 12 to 28 in c7289bd

	/// `admin` API implementation.
	///
	/// This type provides the functionality for handling `admin` related requests.
	pub struct AdminApi {
	/// An interface to interact with the network
	network: NetworkHandle,
	}
	impl AdminApi {
	/// Creates a new instance of `AdminApi`.
	pub fn new(network: NetworkHandle) -> AdminApi {
	AdminApi { network }
	}
	}
	#[async_trait]
	impl AdminApiServer for AdminApi {

Additional context

No response

[leruaa]

I would like to take this on

[leruaa]

@mattsse What do you think is the best to build client_version? I was thinking to use clap::crate_version!(), and transmit it to NetworkHandle via NetworkConfig.

[mattsse]

hmm I guess this is just the Client name in NetworkStatus, we can just use that for now.