GH-48820: [Ruby] Add support for writing null array #48821
+909
−179
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Rationale for this change
Let's implement a minimum streaming/file writer with only null array support.
What changes are included in this PR?
ArrowFormat::StreamingWriterArrowFormat::FileWriterArrowFormat::FBshortcut#to_flat_buffersAre these changes tested?
Yes.
Are there any user-facing changes?
Yes.