Metadata V16: Implement support for Pallet View Functions (#1981)

* Support Pallet View Functions in Subxt

* fmt

* clippy

* Move a little view function logic to subxt_core

* clippy

* Add back check that prob isnt needed

* avoid vec macro in core

* Add view funciton test and apply various fixes to get it working

* Add test for dynamic view fn call and fix issues

* clippy

* fix test-runtime

* fmt

* remove export

* avoid vec for nostd core

* use const instead of fn for view fn call name

* Update to support latest unstable metadata

* Update metadata stripping tests for new v16 version

subxt/src/client/offline_client.rs

@@ -11,6 +11,7 @@ use crate::{
     runtime_api::RuntimeApiClient,
     storage::StorageClient,
     tx::TxClient,
+    view_functions::ViewFunctionsClient,
     Metadata,
 };
 
@@ -67,11 +68,16 @@ pub trait OfflineClientT<T: Config>: Clone + Send + Sync + 'static {
         BlocksClient::new(self.clone())
     }
 
-    /// Work with runtime API.
+    /// Work with runtime APIs.
     fn runtime_api(&self) -> RuntimeApiClient<T, Self> {
         RuntimeApiClient::new(self.clone())
     }
 
+    /// Work with View Functions.
+    fn view_functions(&self) -> ViewFunctionsClient<T, Self> {
+        ViewFunctionsClient::new(self.clone())
+    }
+
     /// Work this custom types.
     fn custom_values(&self) -> CustomValuesClient<T, Self> {
         CustomValuesClient::new(self.clone())
@@ -150,6 +156,21 @@ impl<T: Config> OfflineClient<T> {
         <Self as OfflineClientT<T>>::constants(self)
     }
 
+    /// Work with blocks.
+    pub fn blocks(&self) -> BlocksClient<T, Self> {
+        <Self as OfflineClientT<T>>::blocks(self)
+    }
+
+    /// Work with runtime APIs.
+    pub fn runtime_api(&self) -> RuntimeApiClient<T, Self> {
+        <Self as OfflineClientT<T>>::runtime_api(self)
+    }
+
+    /// Work with View Functions.
+    pub fn view_functions(&self) -> ViewFunctionsClient<T, Self> {
+        <Self as OfflineClientT<T>>::view_functions(self)
+    }
+
     /// Access custom types
     pub fn custom_values(&self) -> CustomValuesClient<T, Self> {
         <Self as OfflineClientT<T>>::custom_values(self)