Hi, I would like to request a util to deep copy an Array with the following semantic. 

Result<shared_ptr<ArrayData>> DeepCopyArrayData(const ArrayData& arr, int64 offset = 0, int64 length = -1/*, pool=...*/);

This was discussed some time back in Zulip [1]. 

[1] https://ursalabs.zulipchat.com/#narrow/stream/180245-dev/topic/create.20a.20deep.20copy.20of.20buffers

Reporter: Niranda Perera / @nirandaperera

Related issues:

• [Python] Pickling a sliced array serializes all the buffers (relates to)
• [Python] Make self_destruct and RecordBatchReader work better together (relates to)

_{Note: This issue was originally created as ARROW-14982. Please see the migration documentation for further details.}