[I] [object_store] Run requests on a different tokio runtime [arrow-rs-object-store]

["alamb (via GitHub)" <gi...@apache.org>]

alamb opened a new issue, #13:
URL: https://github.com/apache/arrow-rs-object-store/issues/13

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   There are cases where one would like to use a different Tokio threadpool for making object store requests. For example, see this ticket in DataFusion
   - https://github.com/apache/datafusion/issues/12393
   
   Note it is now possible to use object_store without `reqwest` ~(and therefore potentially without tokio), however I think tokio is still important enough to warrant this feature~
   - https://github.com/apache/arrow-rs/pull/7183
   
   **Describe the solution you'd like**
   I would like some way, with an example, of making object store requests from an `async` function running on one tokio runtime (`Handle`) and execute on another
   
   **Describe alternatives you've considered**
   @tustvold  has a proposal to do this in https://github.com/apache/arrow-rs/pull/7253, so this is the corresponding ticket explaining the rationale
   
   **Additional context**
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