Update to libp2p-0.23. (#6870)

* Update to libp2p-0.23.

Thereby incorporate bandwidth measurement along the
lines previously done by libp2p itself.

* Tweak dependencies for wasm32 compilation.

For wasm32 we need to enable unstable features to
make `task::Builder::local` available.

* Simplify dependencies.

* Simplify.

Leave the calculation of bytes sent/received per second
to the outer layers of the code, subject to their own
individual update intervals.

* Cleanup

* Re-add lost dev dependency.

* Avoid division by zero.

* Remove redundant metric.

* Enable sending of noise legacy handshakes.

* Add comment about monotonic gauge.

* CI

substrate/Cargo.lock

@@ -300,6 +300,12 @@ dependencies = [
  "webpki-roots 0.19.0",
 ]
 
+[[package]]
+name = "atomic"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64f46ca51dca4837f1520754d1c8c36636356b81553d928dc9c177025369a06e"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -2797,10 +2803,11 @@ checksum = "c7d73b3f436185384286bd8098d17ec07c9a7d2388a6599f824d8502b529702a"
 
 [[package]]
 name = "libp2p"
-version = "0.22.0"
+version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0306a49ee6a89468f96089906f36b0eef82c988dcfc8acf3e2dcd6ad1c859f85"
+checksum = "b1ebb6c031584a5af181fe3a1e4b074af5d0b1a3b31663200f0251f4bcff6b5c"
 dependencies = [
+ "atomic",
  "bytes 0.5.4",
  "futures 0.3.5",
  "lazy_static",
@@ -2965,9 +2972,9 @@ dependencies = [
 
 [[package]]
 name = "libp2p-noise"
-version = "0.21.0"
+version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f353f8966bbaaf7456535fffd3f366f153148773a0cf04b2ec3860955cb720e"
+checksum = "1e594f2de0c23c2b7ad14802c991a2e68e95315c6a6c7715e53801506f20135d"
 dependencies = [
  "bytes 0.5.4",
  "curve25519-dalek",