Adds instance support for composite enums (#1857)

Fixes https://github.com/paritytech/polkadot-sdk/issues/1839

Currently, `composite_enum`s do not support pallet instances. This PR
allows the following:
```rust
	#[pallet::composite_enum]
	pub enum HoldReason<I: 'static = ()> {
		SomeHoldReason
	}
```

### Todo

- [x]  UI Test

substrate/frame/balances/src/lib.rs

@@ -256,7 +256,7 @@ pub mod pallet {
 
 		/// The overarching hold reason.
 		#[pallet::no_default_bounds]
-		type RuntimeHoldReason: Parameter + Member + MaxEncodedLen + Ord + Copy;
+		type RuntimeHoldReason: Parameter + Member + MaxEncodedLen + Copy;
 
 		/// Weight information for extrinsics in this pallet.
 		type WeightInfo: WeightInfo;
@@ -300,7 +300,7 @@ pub mod pallet {
 		type ReserveIdentifier: Parameter + Member + MaxEncodedLen + Ord + Copy;
 
 		/// The ID type for freezes.
-		type FreezeIdentifier: Parameter + Member + MaxEncodedLen + Ord + Copy;
+		type FreezeIdentifier: Parameter + Member + MaxEncodedLen + Copy;
 
 		/// The maximum number of locks that should exist on an account.
 		/// Not strictly enforced, but used for weight estimation.