HiveInterface missing 'path' parameter for boxExists & deleteBoxFromDisk

Both `boxExists` and `deleteBoxFromDisk` have an optional named `path` parameter in `HiveImpl`:

```
Future deleteBoxFromDisk(String name, {String? path}) async {
//...
}
Future boxExists(String name, {String? path}) async {
//..
}
```

However, `HiveInterface` does not contain these parameter and as such they cannot be used:
```
Future deleteBoxFromDisk(String name);
Future boxExists(String name);
```
https://github.com/hivedb/hive/blob/413ae3594f7142eb8b4b428f60c5c090d12d0799/hive/lib/src/hive.dart#L54

Start with the HiveInterface declarations in hive/lib/src/hive.dart and compare them with the boxExists and deleteBoxFromDisk signatures in HiveImpl. Expose the optional named path parameter through the interface, then verify both methods can be called with path when referenced through HiveInterface.

Written by the indexing model from the issue text.