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GH-44344: [Java] fix VectorSchemaRoot.getTransferPair for NullVector (#44631)

### Rationale for this change

Do not throw [UnsupportedOperationException("Tried to get allocator from NullVector")](https://github.com/apache/arrow/blob/release-18.0.0-rc0/java/vector/src/main/java/org/apache/arrow/vector/NullVector.java#L160) from [VectorSchemaRoot.slice()](https://github.com/apache/arrow/blob/release-18.0.0-rc0/java/vector/src/main/java/org/apache/arrow/vector/VectorSchemaRoot.java#L341) when slicing a VSR containing a NullVector or ZeroVector. Details in https://github.com/apache/arrow/issues/44344

### Are these changes tested?

Added unit test that would trigger an UnsupportedOperationException on the legacy path.
* GitHub Issue: #44344

Authored-by: Maksim Yegorov <59841139+maksimyego-db@users.noreply.github.com>
Signed-off-by: David Li <li.davidm96@gmail.com>