frame-support: RuntimeDebug\Eq\PartialEq impls for Imbalance (#1717)

Derive `RuntimeDebug\Eq\PartialEq` but do not bound any generics.

This achieved by using their equivalent no bound versions:
`EqNoBound\PartialEqNoBound\RuntimeDebugNoBound`.

Deriving with `Debug`, `Eq`, and `PartialEq` for the `Debt` and `Credit`
type aliases of `Imbalance` is not feasible due to the `OnDrop` and
`OppositeOnDrop` generic types lacking implementations of the same
traits.

This absence posed challenges in testing and any scenarios that demanded
the traits implementations for the type.

substrate/frame/support/src/traits/tokens/fungible/imbalance.rs

@@ -23,7 +23,8 @@ use crate::traits::{
 	misc::{SameOrOther, TryDrop},
 	tokens::Balance,
 };
-use sp_runtime::{traits::Zero, RuntimeDebug};
+use frame_support_procedural::{EqNoBound, PartialEqNoBound, RuntimeDebugNoBound};
+use sp_runtime::traits::Zero;
 use sp_std::marker::PhantomData;
 
 /// Handler for when an imbalance gets dropped. This could handle either a credit (negative) or
@@ -43,7 +44,7 @@ impl<Balance> HandleImbalanceDrop<Balance> for () {
 ///
 /// Importantly, it has a special `Drop` impl, and cannot be created outside of this module.
 #[must_use]
-#[derive(RuntimeDebug, Eq, PartialEq)]
+#[derive(EqNoBound, PartialEqNoBound, RuntimeDebugNoBound)]
 pub struct Imbalance<
 	B: Balance,
 	OnDrop: HandleImbalanceDrop<B>,

substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs

@@ -23,7 +23,8 @@ use crate::traits::{
 	misc::{SameOrOther, TryDrop},
 	tokens::{AssetId, Balance},
 };
-use sp_runtime::{traits::Zero, RuntimeDebug};
+use frame_support_procedural::{EqNoBound, PartialEqNoBound, RuntimeDebugNoBound};
+use sp_runtime::traits::Zero;
 use sp_std::marker::PhantomData;
 
 /// Handler for when an imbalance gets dropped. This could handle either a credit (negative) or
@@ -38,7 +39,7 @@ pub trait HandleImbalanceDrop<AssetId, Balance> {
 ///
 /// Importantly, it has a special `Drop` impl, and cannot be created outside of this module.
 #[must_use]
-#[derive(RuntimeDebug, Eq, PartialEq)]
+#[derive(EqNoBound, PartialEqNoBound, RuntimeDebugNoBound)]
 pub struct Imbalance<
 	A: AssetId,
 	B: Balance,