Add subxt-historic crate for accesing historic (non head-of-chain) blocks (#2040)

* WIP subxt-historic

* WIP subxt-historic

* WIP subxt-historic; flesh out basic foundations

* WIP filling in extrinsic decoding functionality

* iter and decode transaction extensions

* Fill in the Online/OfflineClient APIs and move more things to be part of the chain Config

* WIP storage

* clippy, fmt, finish extrinsics example

* prep for 0.0.1 release to claim crate name

* fix README link

* fmt

* WIP thinking about storage APIs

* WIP working out storage APIs

* Storage plain value fetching first pass

* WIP storage: first pass iterating over values done

* First apss finishing storage APIs

* fmt and clippy

* Create a storage example showing fetch and iteration

* Bump to frame-decode 0.9.0

* Bump subxt-historic to 0.0.3 for preview release

* Remove unused deps

* fix import

* clippy

* doc fixes

* tweak CI and fix some cargo hack findings

* Update README: subxt-historic is prerelease

Cargo.lock

@@ -1931,16 +1931,20 @@ dependencies = [
 
 [[package]]
 name = "frame-decode"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1276c23a1fb234d9f81b5f71c526437f2a55ab4419f29bfe1196ac4ee2f706c"
+checksum = "c470df86cf28818dd3cd2fc4667b80dbefe2236c722c3dc1d09e7c6c82d6dfcd"
 dependencies = [
  "frame-metadata 23.0.0",
  "parity-scale-codec",
  "scale-decode",
+ "scale-encode",
  "scale-info",
+ "scale-info-legacy",
  "scale-type-resolver",
+ "serde_yaml",
  "sp-crypto-hashing",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -4447,6 +4451,21 @@ dependencies = [
  "syn 2.0.101",
 ]
 
+[[package]]
+name = "scale-info-legacy"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f5da3f59983b08a37d8d979d2326bdc00e8cca57b3d28fb05bdc0f6d7c28600c"
+dependencies = [
+ "hashbrown 0.15.3",
+ "scale-type-resolver",
+ "serde",
+ "smallstr",
+ "smallvec",
+ "thiserror 2.0.12",
+ "yap",
+]
+
 [[package]]
 name = "scale-type-resolver"
 version = "0.2.0"
@@ -4744,6 +4763,19 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.9.34+deprecated"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a8b1a1a2ebf674015cc02edccce75287f1a0130d394307b36743c2f5d504b47"
+dependencies = [
+ "indexmap 2.9.0",
+ "itoa",
+ "ryu",
+ "serde",
+ "unsafe-libyaml",
+]
+
 [[package]]
 name = "serdect"
 version = "0.2.0"
@@ -4860,6 +4892,15 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "826167069c09b99d56f31e9ae5c99049e932a98c9dc2dac47645b08dbbf76ba7"
 
+[[package]]
+name = "smallstr"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63b1aefdf380735ff8ded0b15f31aab05daf1f70216c01c02a12926badd1df9d"
+dependencies = [
+ "smallvec",
+]
+
 [[package]]
 name = "smallvec"
 version = "1.15.0"
@@ -5670,6 +5711,28 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "subxt-historic"
+version = "0.0.3"
+dependencies = [
+ "frame-decode",
+ "frame-metadata 23.0.0",
+ "futures",
+ "hex",
+ "parity-scale-codec",
+ "primitive-types",
+ "scale-decode",
+ "scale-info",
+ "scale-info-legacy",
+ "scale-type-resolver",
+ "scale-value",
+ "sp-crypto-hashing",
+ "subxt-rpcs",
+ "thiserror 2.0.12",
+ "tokio",
+ "url",
+]
+
 [[package]]
 name = "subxt-lightclient"
 version = "0.43.0"
@@ -6048,7 +6111,9 @@ dependencies = [
  "bytes",
  "libc",
  "mio",
+ "parking_lot",
  "pin-project-lite",
+ "signal-hook-registry",
  "socket2",
  "tokio-macros",
  "windows-sys 0.52.0",
@@ -6399,6 +6464,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"