Support async CustomOpen in FileSource
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
In the [proposed implementation](https://github.com/apache/arrow/pull/37918) of [OpenAsync method for FileSource](https://github.com/apache/arrow/issues/37917), custom_open_ is blocking. To make this fully async, FileSource should be extended to accept a custom_open_ that returns a future.
### Component(s)
C++
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