Move substrate-bridge-relay into repository (#1)

* Initial commit. CLI which parses RPC urls.

* Establish ws connections and make simple RPC requests.

* Complete bridge setup.

* Process subscription events.

* Ctrl-C handler.

* Write a bare-bones README and copy in design doc.

* Modularize code a little bit.

* Communicate with each chain in a separate task.

* Parse headers from RPC subscription notifications.

* Send (fake) extrinsics across bridge channels.

And now it's deadlocked.

* Fix deadlock.

* Clarify in README that this is not-in-progress.

* Move everything into a single folder

* Move Substrate relay into appropriate folder

* Get the Substrate Relay node compiling

* Update Cargo.lock

* Use new composite accounts from Substrate

* Remove specification document

It has been moved to the Wiki on the Github repo.

* Update author + remove comments

* Use latest master for jsonrpsee

Required renaming some stuff (e.g Client -> RawClient)

Co-authored-by: Jim Posen <jim.posen@gmail.com>

bridges/modules/substrate/src/lib.rs

@@ -247,6 +247,9 @@ mod tests {
 		type MaximumBlockLength = ();
 		type Version = ();
 		type ModuleToIndex = ();
+		type AccountData = ();
+		type OnNewAccount = ();
+		type OnReapAccount = ();
 	}
 
 	impl Trait for Test {}