chore: disable chain extension example and add todo for replacement

Author: davidsemakula

examples/chain-extension/README.md

@@ -1,5 +1,7 @@
 # Testing a chain extension
 
+TODO: Replace with precompile example since chain extensions are deprecated in pallet-revive.
+
 This example shows how you can use `drink` to test a chain extension.
 
 From the perspective of a contract implementation or writing tests there is nothing special (i.e., more than usual) that you have to do to interact with a chain extension.

examples/chain-extension/src/chain_extension_ink_side.rs

@@ -1,3 +1,4 @@
+/*
 use ink::env::{chain_extension::FromStatusCode, DefaultEnvironment, Environment};
 
 /// Simple chain extension that provides some staking information.
@@ -38,3 +39,4 @@ impl Environment for StakingEnvironment {
 
     type ChainExtension = StakingExtension;
 }
+*/

examples/chain-extension/src/chain_extension_runtime_side.rs

@@ -1,3 +1,4 @@
+/*
 use drink::pallet_revive::{
     chain_extension::{ChainExtension, Config as ContractsConfig, Environment, Ext, RetVal},
     wasm::Memory,
@@ -27,3 +28,4 @@ impl<Runtime: ContractsConfig> ChainExtension<Runtime> for StakingExtension {
         Ok(RetVal::Converging(0))
     }
 }
+*/

examples/chain-extension/src/lib.rs

@@ -1,5 +1,8 @@
 #![cfg_attr(not(feature = "std"), no_std, no_main)]
 
+//! TODO: Replace with precompile example since chain extensions are deprecated in pallet-revive.
+
+/*
 /// Fixed value returned by the example chain extension.
 #[cfg(test)]
 const CHAIN_EXTENSION_RETURN_VALUE: u32 = 100;
@@ -70,3 +73,4 @@ mod tests {
         Ok(())
     }
 }
+*/