Compact proof utilities in sp_trie. (#8574)

* validation extension in sp_io

* need paths

* arc impl

* missing host function in executor

* io to pkdot

* decode function.

* encode primitive.

* trailing tab

* multiple patch

* fix child trie logic

* restore master versionning

* bench compact proof size

* trie-db 22.3 is needed

* line width

* split line

* fixes for bench (additional root may not be needed as original issue was
with empty proof).

* revert compact from block size calculation.

* New error type for compression.

* Adding test (incomplete (failing)).
Also lacking real proof checking (no good primitives in sp-trie crate).

* There is currently no proof recording utility in sp_trie, removing
test.

* small test of child root in proof without a child proof.

* remove empty test.

* remove non compact proof size

* Missing revert.

* proof method to encode decode.

substrate/primitives/trie/src/lib.rs

@@ -23,6 +23,7 @@ mod error;
 mod node_header;
 mod node_codec;
 mod storage_proof;
+mod trie_codec;
 mod trie_stream;
 
 use sp_std::{boxed::Box, marker::PhantomData, vec::Vec, borrow::Borrow};
@@ -35,7 +36,7 @@ pub use error::Error;
 pub use trie_stream::TrieStream;
 /// The Substrate format implementation of `NodeCodec`.
 pub use node_codec::NodeCodec;
-pub use storage_proof::StorageProof;
+pub use storage_proof::{StorageProof, CompactProof};
 /// Various re-exports from the `trie-db` crate.
 pub use trie_db::{
 	Trie, TrieMut, DBValue, Recorder, CError, Query, TrieLayout, TrieConfiguration, nibble_ops, TrieDBIterator,
@@ -45,6 +46,9 @@ pub use memory_db::KeyFunction;
 pub use memory_db::prefixed_key;
 /// Various re-exports from the `hash-db` crate.
 pub use hash_db::{HashDB as HashDBT, EMPTY_PREFIX};
+/// Trie codec reexport, mainly child trie support
+/// for trie compact proof.
+pub use trie_codec::{decode_compact, encode_compact, Error as CompactProofError};
 
 #[derive(Default)]
 /// substrate trie layout