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

testing/integration-tests/src/full_client/storage/mod.rs

@@ -3,6 +3,7 @@
 // see LICENSE for license details.
 
 use crate::{node_runtime, subxt_test, test_context, utils::wait_for_blocks};
+use polkadot_sdk::sp_core;
 
 #[cfg(fullclient)]
 use subxt::utils::AccountId32;