Move authorities interface from Core to consensus (#1412)

* Move authorities interface from Core to consensus

f

* notify all caches of block insert + create with up-to-date best_fin

* merged authorities_are_cached from light_grandpa_import2

* Add ProvideCache trait

* Create helper function for 'get_cache'

* Fix some formatting

* Bump impl version

* Resolve wasm conflicts

* Apply review comments

* Use try_for_each

* Move authorities interface from Core to consensus

f

* notify all caches of block insert + create with up-to-date best_fin

* merged authorities_are_cached from light_grandpa_import2

* Add ProvideCache trait

* Create helper function for 'get_cache'

* Fix some formatting

* Bump impl version

* Resolve wasm conflicts

* Apply review comments

* Use try_for_each

* Move authorities interface from Core to consensus

f

* notify all caches of block insert + create with up-to-date best_fin

* merged authorities_are_cached from light_grandpa_import2

* Add ProvideCache trait

* Create helper function for 'get_cache'

* Fix some formatting

* Bump impl version

* Resolve wasm conflicts

* Apply review comments

* Use try_for_each

* Increment impl_version

* Update lib.rs

substrate/node-template/runtime/wasm/Cargo.lock

@@ -1273,6 +1273,7 @@ dependencies = [
  "srml-timestamp 0.1.0",
  "substrate-client 0.1.0",
  "substrate-consensus-aura-primitives 0.1.0",
+ "substrate-consensus-authorities 0.1.0",
  "substrate-offchain-primitives 0.1.0",
  "substrate-primitives 0.1.0",
 ]
@@ -2449,6 +2450,20 @@ dependencies = [
  "substrate-client 0.1.0",
 ]
 
+[[package]]
+name = "substrate-consensus-authorities"
+version = "0.1.0"
+dependencies = [
+ "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sr-io 0.1.0",
+ "sr-primitives 0.1.0",
+ "sr-std 0.1.0",
+ "sr-version 0.1.0",
+ "srml-support 0.1.0",
+ "substrate-client 0.1.0",
+ "substrate-primitives 0.1.0",
+]
+
 [[package]]
 name = "substrate-consensus-common"
 version = "0.1.0"