Support constructing and submitting V5 transactions (#1931)

* TransactionExtensions basic support for V5 VerifySignature and renames

* WIP: subxt-core v5 transaction support

* Subxt to support V5 extrinsics

* WIP tests failing with wsm trap error

* Actually encode mortality to fix tx encode issue

* fmt

* rename to sign_with_account_and_signature

* Add explicit methods for v4 and v5 ext construction

* clippy

* fix wasm example and no mut self where not needed

* fix doc example

* another doc fix

* Add tests for tx encoding and fix v5 encode issue

* add copyright and todo

* refactor APIs to have clear v4/v5 split in core and slightly nicer split in subxt proper

* rename Partial/SubmittableExtrinsic to *Transaction

* Remove SignerT::address since it's not needed

* doc fixes

* fmt

* doc fixes

* Fix comment number

* Clarify panic behaviour of inject_signature

* fmt

signer/src/ecdsa.rs

@@ -345,10 +345,6 @@ mod subxt_compat {
             self.public_key().into()
         }
 
-        fn address(&self) -> T::Address {
-            self.public_key().into()
-        }
-
         fn sign(&self, signer_payload: &[u8]) -> T::Signature {
             self.sign(signer_payload).into()
         }

signer/src/eth.rs

@@ -164,7 +164,7 @@ impl FromStr for DerivationPath {
 }
 
 /// A signature generated by [`Keypair::sign()`].
-#[derive(Debug, Clone, Copy, PartialEq, Eq, codec::Encode)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, codec::Encode, codec::Decode)]
 pub struct Signature(pub [u8; 65]);
 
 impl AsRef<[u8; 65]> for Signature {
@@ -267,10 +267,6 @@ mod subxt_compat {
             self.public_key().into()
         }
 
-        fn address(&self) -> T::Address {
-            self.public_key().into()
-        }
-
         fn sign(&self, signer_payload: &[u8]) -> T::Signature {
             self.sign(signer_payload).into()
         }
@@ -404,11 +400,6 @@ mod test {
 
         }
 
-        #[test]
-        fn check_account_id_eq_address(keypair in keypair()) {
-            assert_eq!(SubxtSigner::account_id(&keypair), SubxtSigner::address(&keypair));
-        }
-
         #[test]
         fn check_signing_and_verifying_matches(keypair in keypair(), msg in ".*") {
             let sig = SubxtSigner::sign(&keypair, msg.as_bytes());

signer/src/sr25519.rs

@@ -338,10 +338,6 @@ mod subxt_compat {
             self.public_key().into()
         }
 
-        fn address(&self) -> T::Address {
-            self.public_key().into()
-        }
-
         fn sign(&self, signer_payload: &[u8]) -> T::Signature {
             self.sign(signer_payload).into()
         }