Struct support for NULL_EQUALS binary operation

[rwlee]

Description

Adds support for Spark's null aware equality binop and expands/improves Java testing for struct binops. Properly tests null structs and full operator testing coverage. Utilizes existing Spark struct binop support with JNI changes to force the full null-aware comparison.

Expands on #11153

Partial solution to #8964 -- NULL_MAX and NULL_MIN still outstanding.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-22.10@0df6178). Click here to learn what that means.
The diff coverage is n/a.

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[upsj]

C++ changes LGTM!

[rwlee]

@gpucibot merge