Kill the light client, CHTs and change tries. (#10080)

* Remove light client, change tries and CHTs

* Update tests

* fmt

* Restore changes_root

* Fixed benches

* Cargo fmt

* fmt

* fmt

substrate/bin/node/primitives/src/lib.rs

@@ -57,7 +57,7 @@ pub type Hash = sp_core::H256;
 pub type Timestamp = u64;
 
 /// Digest item type.
-pub type DigestItem = generic::DigestItem<Hash>;
+pub type DigestItem = generic::DigestItem;
 /// Header type.
 pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
 /// Block type.