rpc server with HTTP/WS on the same socket (#12663)

* jsonrpsee v0.16

add backwards compatibility

run old http server on http only

* cargo fmt

* update jsonrpsee 0.16.1

* less verbose cors log

* fix nit in log: WS -> HTTP

* revert needless changes in Cargo.lock

* remove unused features in tower

* fix nits; add client-core feature

* jsonrpsee v0.16.2

substrate/client/rpc-spec-v2/src/chain_spec/tests.rs

@@ -17,7 +17,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 use super::*;
-use jsonrpsee::{types::EmptyParams, RpcModule};
+use jsonrpsee::{types::EmptyServerParams as EmptyParams, RpcModule};
 use sc_chain_spec::Properties;
 
 const CHAIN_NAME: &'static str = "TEST_CHAIN_NAME";