Support v16 metadata and use it by default if it's available (#1999)

* Support v16 metadata and use it by default if it's available

* lockfile

* fix blocks test; new transaction extension in kitchensink runtime

* Bump scale-typegen to 0.11.1 to cater for Duration prelude type

* fmt

* Fix no-std test building

* Cargo update and bump substrate deps

* Update test and no-std deps

* fmt

* fix test

metadata/src/from/mod.rs

@@ -8,6 +8,11 @@ mod v14;
 mod v15;
 mod v16;
 
+/// The metadata versions that we support converting into [`crate::Metadata`].
+/// These are ordest from highest to lowest, so that the metadata we'd want to
+/// pick first is first in the array.
+pub const SUPPORTED_METADATA_VERSIONS: [u32; 3] = [16, 15, 14];
+
 /// An error emitted if something goes wrong converting [`frame_metadata`]
 /// types into [`crate::Metadata`].
 #[derive(Debug, PartialEq, Eq, DeriveError)]
@@ -79,9 +84,7 @@ impl TryFrom<frame_metadata::RuntimeMetadataPrefixed> for crate::Metadata {
             }
             frame_metadata::RuntimeMetadata::V14(m) => m.try_into(),
             frame_metadata::RuntimeMetadata::V15(m) => m.try_into(),
-            frame_metadata::RuntimeMetadata::V16(_opaque) => {
-                Err(TryFromError::UnsupportedMetadataVersion(16))
-            }
+            frame_metadata::RuntimeMetadata::V16(m) => m.try_into(),
         }
     }
 }

metadata/src/lib.rs

@@ -42,6 +42,7 @@ use utils::{
 type ArcStr = Arc<str>;
 
 pub use from::TryFromError;
+pub use from::SUPPORTED_METADATA_VERSIONS;
 pub use utils::validation::MetadataHasher;
 
 type CustomMetadataInner = frame_metadata::v15::CustomMetadata<PortableForm>;