subxt-core crate (#1466)

* start migrating, broken

* first iteration of updating

* fmt and clippy

* add Composite<u32> decoding via scale value patch

* bump scale type gen versions

* fix decoding with new scale decode

* compiling with changed deps

* core utils, condig, client, metadata

* core crate compiling

* signer crate no once lock

* add core to no-std-tests, change imports

* broken commit, start pulling everything together in subxt

* port more things to subxt

* events in core crate, extrinsics sadly much more difficult

* almost all examples pass again

* dynamic values fix in examples

* fix no std issue and fmt

* remove unused dependencies

* fix lightclient impl

* runtime version refactor

* formatting and addressing nits

* more comments addressed

* update wasm example and no-std-signer tests

* other nits and error impl on signer errors

* fix feature flag

* fix runtime version refactor

* fix doc links

* fix integration tests

* fix feature flag gated client state

* fix native feature in CI

* fix lightclient utils

* make imports more lean in subxt-core

* integrate changes from subxt-core imports into subxt

* other changes in subxt simplify imports more

* fix  and docs

* doc false for cli

* fix clippy

* remove events block hash in tests

* codegen no-std support in generated code

* export alloc crate for no-std codegen

* fix doc test

* implement James comments

* remove std traits, use core traits instead

* address nits

* remove unusued dep in no-std tests

* fix Box import in no_std

* sp-crypto-hashing instead of sp-core-hashing

* bump scale-typegen, add no std codegen tests

* fix some things

* replace unmaintained derivative with derive_where to remove non-canonical warnings

* fmt

* remove unused dep

* fix deps

* update artifacts to fix type ID mismatches

* bump to latest scale-typegen

---------

Co-authored-by: James Wilson <james@jsdw.me>

core/src/lib.rs

@@ -0,0 +1,42 @@
+// Copyright 2019-2024 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+//! # Subxt-core
+//!
+//! `#[no_std]` compatible core crate for subxt.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+pub extern crate alloc;
+
+pub mod blocks;
+pub mod client;
+pub mod config;
+pub mod constants;
+pub mod custom_values;
+pub mod dynamic;
+pub mod error;
+pub mod events;
+pub mod metadata;
+pub mod runtime_api;
+pub mod storage;
+pub mod tx;
+pub mod utils;
+
+pub use config::Config;
+pub use error::Error;
+pub use metadata::Metadata;
+
+#[macro_use]
+mod macros;
+
+pub mod ext {
+    pub use codec;
+    pub use scale_decode;
+    pub use scale_encode;
+
+    cfg_substrate_compat! {
+        pub use sp_runtime;
+        pub use sp_core;
+    }
+}