Upgrade from futures-preview to futures 0.3.1, and remove futures 0.1 where currently possible (#4083)

* Migrate node and node-template

* Migrate srml

* Simple changes

* Add async-std for interval

* Fix test-runtime warning

* Small changes

* move futures01 in core/rpc to dev-deps

* Change wasm CI builds

* Switch to async-std 1.0.1

* Remove async-std dep of network

* Add modified lockfile

* Fix node cli browser build

* Remove authority-discovery async-std dep

* Add Send + Sync to interval dyn stream

substrate/client/rpc/src/state/state_full.rs

@@ -19,7 +19,7 @@
 use std::collections::{BTreeMap, HashMap};
 use std::sync::Arc;
 use std::ops::Range;
-use futures03::{future, StreamExt as _, TryStreamExt as _};
+use futures::{future, StreamExt as _, TryStreamExt as _};
 use log::warn;
 use jsonrpc_pubsub::{typed::Subscriber, SubscriptionId};
 use rpc::{

substrate/client/rpc/src/state/state_light.rs

@@ -21,7 +21,7 @@ use std::{
 	collections::{HashSet, HashMap, hash_map::Entry},
 };
 use codec::Decode;
-use futures03::{
+use futures::{
 	future::{ready, Either},
 	channel::oneshot::{channel, Sender},
 	FutureExt, TryFutureExt,
@@ -753,7 +753,7 @@ mod tests {
 
 	#[test]
 	fn maybe_share_remote_request_shares_request() {
-		type UnreachableFuture = futures03::future::Ready<Result<u32, Error>>;
+		type UnreachableFuture = futures::future::Ready<Result<u32, Error>>;
 
 		let shared_requests = SimpleSubscriptions::default();
 

substrate/client/rpc/src/state/tests.rs

@@ -20,7 +20,7 @@ use self::error::Error;
 
 use std::sync::Arc;
 use assert_matches::assert_matches;
-use futures::stream::Stream;
+use futures01::stream::Stream;
 use primitives::storage::well_known_keys;
 use sr_io::hashing::blake2_256;
 use test_client::{