Use frame-decode for core extrinsic decode logic (#1785)

* WIP using frame-decode for core extrinsic decode logic

* fmt

* Fix dependabot config

* clippy

* tidy some imports

* Fix a couple of tests

* Update to frame-decode 0.0.7

* fix docs

* Decode exts earlier to avoid doing it every iter/find step

* frame-decode to 0.1.0

* fmt

* clippy

* fix wasm example

* doc test fixes

* Fix test

* Fix a couple of subxt_core tests

Cargo.lock

@@ -1748,6 +1748,21 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "frame-decode"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed90459016b06a2855321469cb01fbc74208c80c06b085d1ed13162cf8bd7e1b"
+dependencies = [
+ "frame-metadata 16.0.0",
+ "hex",
+ "parity-scale-codec",
+ "scale-decode",
+ "scale-info",
+ "scale-type-resolver",
+ "sp-crypto-hashing",
+]
+
 [[package]]
 name = "frame-metadata"
 version = "15.1.0"
@@ -5313,6 +5328,7 @@ dependencies = [
  "bitvec",
  "blake2",
  "derive-where",
+ "frame-decode",
  "frame-metadata 16.0.0",
  "hashbrown 0.14.5",
  "hex",
@@ -5387,6 +5403,7 @@ dependencies = [
  "assert_matches",
  "bitvec",
  "criterion",
+ "frame-decode",
  "frame-metadata 16.0.0",
  "hashbrown 0.14.5",
  "parity-scale-codec",