Ensure correct variant count in Runtime[Hold/Freeze]Reason (#1900)

closes https://github.com/paritytech/polkadot-sdk/issues/1882

## Breaking Changes

This PR introduces a new item to `pallet_balances::Config`:

```diff
trait Config {
++    type RuntimeFreezeReasons;
}
```

This value is only used to check it against `type MaxFreeze`. A similar
check has been added for `MaxHolds` against `RuntimeHoldReasons`, which
is already given to `pallet_balances`.

In all contexts, you should pass the real `RuntimeFreezeReasons`
generated by `construct_runtime` to `type RuntimeFreezeReasons`. Passing
`()` would also work, but it would imply that the runtime uses no
freezes at all.

---------

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

substrate/frame/examples/dev-mode/src/tests.rs

@@ -78,6 +78,7 @@ impl pallet_balances::Config for Test {
 	type FreezeIdentifier = ();
 	type MaxFreezes = ();
 	type RuntimeHoldReason = RuntimeHoldReason;
+	type RuntimeFreezeReason = RuntimeFreezeReason;
 	type MaxHolds = ();
 }