Storage chains: serve transactions over IPFS/bitswap (#7963)

* IPFS server for transactions

* Style

* Indent

* Log message

* CLI option

* Apply suggestions from code review

Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>

* Style

* Style

* Minor fixes

Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>

substrate/client/cli/src/params/network_params.rs

@@ -110,6 +110,10 @@ pub struct NetworkParams {
 	/// security improvements.
 	#[structopt(long)]
 	pub kademlia_disjoint_query_paths: bool,
+
+	/// Join the IPFS network and serve transactions over bitswap protocol.
+	#[structopt(long)]
+	pub ipfs_server: bool,
 }
 
 impl NetworkParams {
@@ -181,6 +185,7 @@ impl NetworkParams {
 			allow_non_globals_in_dht,
 			kademlia_disjoint_query_paths: self.kademlia_disjoint_query_paths,
 			yamux_window_size: None,
+			ipfs_server: self.ipfs_server,
 		}
 	}
 }