GH-38153: [C#] expose ArrayDataConcatenator.Concatenate

[davidhcoe]

Rationale for this change

New C# drivers need the ability to concatenate array data, particularly for metadata calls.

What changes are included in this PR?

Converts a previously internal class and method to a public class and method.

Are these changes tested?

Yes

Are there any user-facing changes?

It exposes previously hidden functionality.

Resolves #38153

• Closes: [C#] Expose ArrayDataConcatenator.Concatenate #38153

[github-actions]

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See also:

• Other pull requests
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[davidhcoe]

@lidavidm - this is similar to #37652, if you could take a quick look.

[CurtHagenlocher]

Why this instead of (or "and not also") ArrowArrayConcatenator.Concatenate?

[davidhcoe]

It is in addition to that. That was done last week and this was missed.

[github-actions]

⚠️ GitHub issue #38153 has been automatically assigned in GitHub to PR creator.

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 5 benchmarking runs that have been run so far on merge-commit e74d3a9.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details. It also includes information about 3 possible false positives for unstable benchmarks that are known to sometimes produce them.