Implement NetworkRequest for litep2p

[AndreiEres]

Description

Implements NetworkRequest::request for litep2p that we need for networking benchmarks

Review Notes

Duplicates implementation for NetworkService

polkadot-sdk/substrate/client/network/src/service.rs

Lines 1186 to 1205 in 5bf9dd2

	async fn request(
	&self,
	target: sc_network_types::PeerId,
	protocol: ProtocolName,
	request: Vec<u8>,
	fallback_request: Option<(Vec<u8>, ProtocolName)>,
	connect: IfDisconnected,
	) -> Result<(Vec<u8>, ProtocolName), RequestFailure> {
	let (tx, rx) = oneshot::channel();
	self.start_request(target.into(), protocol, request, fallback_request, tx, connect);
	match rx.await {
	Ok(v) => v,
	// The channel can only be closed if the network worker no longer exists. If the
	// network worker no longer exists, then all connections to `target` are necessarily
	// closed, and we legitimately report this situation as a "ConnectionClosed".
	Err(_) => Err(RequestFailure::Network(OutboundFailure::ConnectionClosed)),
	}
	}

[lexnv]

Should we also enable the litep2p request-response benchmark in substrate/client/network/benches/request_response_protocol.rs?

[AndreiEres]

Of course, I just didn't want to mix it in one PR

[AndreiEres]

/cmd prdoc --help

[github-actions]

Command help:

usage: /cmd prdoc [-h] [--pr PR]
                  [--audience [{runtime_dev,runtime_user,node_dev,node_operator} ...]]
                  [--bump {patch,minor,major,silent,ignore,none}] [--force]

options:
  -h, --help            show this help message and exit
  --pr PR               The PR number to generate the PrDoc for.
  --audience [{runtime_dev,runtime_user,node_dev,node_operator} ...]
                        The audience of whom the changes may concern. Example:
                        --audience runtime_dev node_dev
  --bump {patch,minor,major,silent,ignore,none}
                        A default bump level for all crates. Example: --bump
                        patch
  --force               Whether to overwrite any existing PrDoc.

[AndreiEres]

/cmd prdoc --audience node_dev --bump patch