Allow to specify multiple relay chain RPC urls for collator node (#1880)

* Allow specification of multiple urls for relay chain rpc nodes

* Add pooled RPC client basics

* Add list of clients to pooled client

* Improve

* Forward requests to dispatcher

* Switch clients on error

* Implement rotation logic

* Improve subscription handling

* Error handling cleanup

* Remove retry from rpc-client

* Improve naming

* Improve documentation

* Improve `ClientManager` abstraction

* Adjust zombienet test

* Add more comments

* fmt

* Apply reviewers comments

* Extract reconnection to extra method

* Add comment to reconnection method

* Clean up some dependencies

* Fix build

* fmt

* Provide alias for cli argument

* Apply review comments

* Rename P* to Relay*

* Improve zombienet test

* fmt

* Fix zombienet sleep

* Simplify zombienet test

* Reduce log clutter and fix starting position

* Do not distribute duplicated imported and finalized blocks

* fmt

* Apply code review suggestions

* Move building of relay chain interface to `cumulus-client-service`

* Refactoring to not push back into channel

* FMT

parachain-template/node/Cargo.toml

@@ -67,10 +67,7 @@ cumulus-client-network = { path = "../../client/network" }
 cumulus-client-service = { path = "../../client/service" }
 cumulus-primitives-core = { path = "../../primitives/core" }
 cumulus-primitives-parachain-inherent = { path = "../../primitives/parachain-inherent" }
-cumulus-relay-chain-inprocess-interface = { path = "../../client/relay-chain-inprocess-interface" }
 cumulus-relay-chain-interface = { path = "../../client/relay-chain-interface" }
-cumulus-relay-chain-rpc-interface = { path = "../../client/relay-chain-rpc-interface" }
-cumulus-relay-chain-minimal-node = { path = "../../client/relay-chain-minimal-node" }
 
 [build-dependencies]
 substrate-build-script-utils = { git = "https://github.com/paritytech/substrate", branch = "master" }