deps: use polkadot-sdk umbrella crate (#1786)

* deps: unify usage of polkadot-sdk crates

* cargo fmt

* fix macro crate

* make tests compile

* fix more nits

* fix doc tests

* fix more nits

* more nits

* core: remove polkadot-sdk/std

* cargo fmt

* remove polkadot-sdk/std by default

* Update metadata/Cargo.toml

* remove more std

* Update Cargo.toml

signer/src/crypto/derive_junction.rs

@@ -3,6 +3,7 @@
 // see LICENSE for license details.
 
 use codec::{Decode, Encode};
+use polkadot_sdk::sp_crypto_hashing;
 
 // This code is taken from sp_core::crypto::DeriveJunction. The logic should be identical,
 // though the API is tweaked a touch.

signer/src/ecdsa.rs

@@ -4,6 +4,7 @@
 
 //! An ecdsa keypair implementation.
 use codec::Encode;
+use polkadot_sdk::sp_crypto_hashing;
 
 use crate::crypto::{seed_from_entropy, DeriveJunction, SecretUri};
 use core::{fmt::Display, str::FromStr};
@@ -359,8 +360,7 @@ mod test {
 
     use super::*;
 
-    use sp_core::crypto::Pair as _;
-    use sp_core::ecdsa::Pair as SpPair;
+    use polkadot_sdk::sp_core::{self, crypto::Pair as _, ecdsa::Pair as SpPair};
 
     #[test]
     fn check_from_phrase_matches() {

signer/src/sr25519.rs

@@ -344,8 +344,8 @@ mod test {
 
     use super::*;
 
-    use sp_core::crypto::Pair as _;
-    use sp_core::sr25519::Pair as SpPair;
+    use polkadot_sdk::sp_core::{self, crypto::Pair as _, sr25519::Pair as SpPair};
+    use polkadot_sdk::sp_keyring;
 
     #[test]
     fn check_from_phrase_matches() {