HoldReason: Improve usage (#13869)

* HoldReason: Improve usage

`HoldReason` was switched recently to use the `composite_enum` attribute that will merge the enums
from all pallets in the runtime to `RuntimeHoldReason`. `pallet-nis` was still requiring that the
variant was passed as constant to call `hold`. The proper implementation is to use the `HoldReason`
from inside the pallet directly when calling `hold`. This is done by adding a `RuntimeHoldReason` as
type to the `Config` trait and requiring that `Currency` is using the same reason. Besides that the
pr changes the name `HoldIdentifier` in `pallet_balances::Config` to `RuntimeHoldReason`.

* Update frame/nis/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Review comment

* Fixes

---------

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/client/executor/benches/bench.rs

@@ -25,7 +25,6 @@ use sc_executor_common::{
 };
 use sc_executor_wasmtime::InstantiationStrategy;
 use sc_runtime_test::wasm_binary_unwrap as test_runtime;
-use sp_wasm_interface::HostFunctions as _;
 use std::sync::{
 	atomic::{AtomicBool, AtomicUsize, Ordering},
 	Arc,