Expand remote keystore interface to allow for hybrid mode (#7628)

* update to latest master

* updates on docs, license, meta

* hide ssrs behind feature flag

* implement remaining functions on the server

* sign server line length fix

* fix tests

* fixup in-memory-keystore

* adding failsafe

* skipping ecdsa test for now

* remote keystore param

* remote sign urls made available

* integrating keystore remotes features

* don't forget the dependency

* remove old cruft

* reset local keystore

* applying suggestions

* Switch to single remote, minor grumbles

* minor grumbles, docs

substrate/primitives/keystore/src/vrf.rs

@@ -20,9 +20,11 @@
 use codec::Encode;
 use merlin::Transcript;
 use schnorrkel::vrf::{VRFOutput, VRFProof};
+
 /// An enum whose variants represent possible
 /// accepted values to construct the VRF transcript
 #[derive(Clone, Encode)]
+#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]
 pub enum VRFTranscriptValue {
 	/// Value is an array of bytes
 	Bytes(Vec<u8>),
@@ -38,6 +40,7 @@ pub struct VRFTranscriptData {
 	pub items: Vec<(&'static str, VRFTranscriptValue)>,
 }
 /// VRF signature data
+#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]
 pub struct VRFSignature {
 	/// The VRFOutput serialized
 	pub output: VRFOutput,