Unwrappable (Lucene 9.0.0 core API)

```
public interface Unwrappable<T>
```
An object with this interface is a wrapper around another object (e.g., a filter with a delegate). The method unwrap() can be called to get the wrapped object

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`T`	`unwrap()`	Unwraps this instance
`static <T> T`	`unwrapAll(T o)`	Unwraps all `Unwrappable`s around the given object.

- Method Detail
  - unwrap
```
T unwrap()
```
    Unwraps this instance
  - unwrapAll
```
static <T> T unwrapAll(T o)
```
    Unwraps all Unwrappables around the given object.