Partial fee estimates for SubmittableExtrinsic (#910)

* add partial_fee estimation to submittable extrinsic

* add integration test

* make functions immune to doctest

* add doc test

* inline encoded_with_len, fix tests

* fix test fmt

* remove unused imoort

* Bump h2 from 0.3.16 to 0.3.17 (#911)

Bumps [h2](https://github.com/hyperium/h2) from 0.3.16 to 0.3.17.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/hyperium/h2/compare/v0.3.16...v0.3.17)

---
updated-dependencies:
- dependency-name: h2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* call_raw returns Res: Decode

* remove import

* remove struct

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

subxt/src/runtime_api/runtime_types.rs

@@ -3,6 +3,7 @@
 // see LICENSE for license details.
 
 use crate::{client::OnlineClientT, error::Error, Config};
+use codec::Decode;
 use derivative::Derivative;
 use std::{future::Future, marker::PhantomData};
 
@@ -32,21 +33,21 @@ where
     Client: OnlineClientT<T>,
 {
     /// Execute a raw runtime API call.
-    pub fn call_raw<'a>(
+    pub fn call_raw<'a, Res: Decode>(
         &self,
         function: &'a str,
         call_parameters: Option<&'a [u8]>,
-    ) -> impl Future<Output = Result<Vec<u8>, Error>> + 'a {
+    ) -> impl Future<Output = Result<Res, Error>> + 'a {
         let client = self.client.clone();
         let block_hash = self.block_hash;
         // Ensure that the returned future doesn't have a lifetime tied to api.runtime_api(),
         // which is a temporary thing we'll be throwing away quickly:
         async move {
-            let data = client
+            let data: Res = client
                 .rpc()
                 .state_call(function, call_parameters, Some(block_hash))
                 .await?;
-            Ok(data.0)
+            Ok(data)
         }
     }
 }