fix: Convert vendor/pezkuwi-subxt from submodule to regular directory

vendor/pezkuwi-subxt/subxt/src/view_functions/mod.rs

@@ -0,0 +1,12 @@
+// Copyright 2019-2025 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+//! Types associated with executing View Function calls.
+
+mod view_function_types;
+mod view_functions_client;
+
+pub use pezkuwi_subxt_core::view_functions::payload::{DynamicPayload, Payload, StaticPayload, dynamic};
+pub use view_function_types::ViewFunctionsApi;
+pub use view_functions_client::ViewFunctionsClient;