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/Cargo.toml

@@ -0,0 +1,82 @@
+[package]
+name = "subxt-core"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+publish = true
+
+license.workspace = true
+readme = "README.md"
+repository.workspace = true
+documentation.workspace = true
+homepage.workspace = true
+description = "A no-std compatible subset of Subxt's functionality"
+keywords = ["parity", "subxt", "extrinsic", "no-std"]
+
+[features]
+default = ["std"]
+std = [
+    "codec/std",
+    "scale-info/std",
+    "scale-value/std",
+    "scale-bits/std",
+    "scale-decode/std",
+    "scale-encode/std",
+    "frame-metadata/std",
+    "subxt-metadata/std",
+    "hex/std",
+    "serde/std",
+    "serde_json/std",
+    "tracing/std",
+    "impl-serde/std",
+    "primitive-types/std",
+]
+substrate-compat = ["sp-core", "sp-runtime"]
+
+[dependencies]
+
+codec = { package = "parity-scale-codec", workspace = true, default-features = false, features = ["derive"] }
+scale-info = { workspace = true, default-features = false, features = ["bit-vec"] }
+scale-value = { workspace = true, default-features = false }
+scale-bits = { workspace = true, default-features = false }
+scale-decode = { workspace = true, default-features = false, features = ["derive", "primitive-types"] }
+scale-encode = { workspace = true, default-features = false, features = ["derive", "primitive-types", "bits"] }
+frame-metadata = { workspace = true, default-features = false }
+subxt-metadata = { workspace = true, default-features = false }
+derive-where = { workspace = true }
+derive_more = { workspace = true }
+hex = { workspace = true, default-features = false, features = ["alloc"] }
+serde = { workspace = true, default-features = false, features = ["derive"] }
+serde_json = { workspace = true, default-features = false, features = ["raw_value", "alloc"] }
+hashbrown = { workspace = true }
+
+
+# For ss58 encoding AccountId32 to serialize them properly:
+base58 = { workspace = true }
+blake2 = { workspace = true }
+
+# Provides some deserialization, types like U256/H256 and hashing impls like twox/blake256:
+impl-serde = { workspace = true, default-features = false }
+primitive-types = { workspace = true, default-features = false, features = ["codec", "serde_no_std", "scale-info"] }
+sp-crypto-hashing = { workspace = true }
+
+# Included if the "substrate-compat" feature is enabled.
+sp-core = { workspace = true, optional = true }
+sp-runtime = { workspace = true, optional = true }
+tracing = { workspace = true, default-features = false }
+
+[dev-dependencies]
+bitvec = { workspace = true }
+codec = { workspace = true, features = ["derive", "bit-vec"] }
+sp-core = { workspace = true }
+sp-keyring = { workspace = true }
+sp-runtime = { workspace = true }
+
+
+[package.metadata.docs.rs]
+defalt-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[package.metadata.playground]
+defalt-features = true