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GH-43966: [Java] Check for nullabilities when comparing StructVector (#43968)



### Rationale for this change

See #43966

### What changes are included in this PR?

Check for nullabilities when comparing StructVector with RangeEqualsVisitor.

### Are these changes tested?

Yes

### Are there any user-facing changes?
No

* GitHub Issue: #43966

Authored-by: youming.whl <youming.whl@antfin.com>
Signed-off-by: David Li <li.davidm96@gmail.com>