Remove in-tree max-encoded-len and use the new SCALE codec crate instead (#9163)

* Update impl-codec to use new upstream MaxEncodedLen trait

* Adapt crates to use the updated codec crate for `MaxEncodedLen`

* Remove max-encoded-len crate altogether

* Fix test compilation in `pallet-proxy`

* reorganize import (#9186)

* Fix remaining `MaxEncodedLen` imports

* Fix remaining old usages of max-encoded-len crate

* Fix UI test

* Manually depend on new impl-codec to fix Polkadot companion build

* Use newly released primitive-types v0.9.1 that has new codec impls

* Make sure codec deps are up-to-date in crates that use them

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

substrate/primitives/core/src/crypto.rs

@@ -20,7 +20,6 @@
 // end::description[]
 
 use crate::{sr25519, ed25519};
-use max_encoded_len::MaxEncodedLen;
 use sp_std::hash::Hash;
 use sp_std::vec::Vec;
 use sp_std::str;
@@ -31,7 +30,7 @@ use sp_std::convert::TryFrom;
 use parking_lot::Mutex;
 #[cfg(feature = "std")]
 use rand::{RngCore, rngs::OsRng};
-use codec::{Encode, Decode};
+use codec::{Encode, Decode, MaxEncodedLen};
 #[cfg(feature = "std")]
 use regex::Regex;
 #[cfg(feature = "std")]