[I] Conditional Put Support [arrow-rs-object-store]

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

tustvold opened a new issue, #129:
URL: https://github.com/apache/arrow-rs-object-store/issues/129

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
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   All ObjectStores apart from S3 support conditional predicates on PUT. This is incredibly useful for building transactions on top of object storage. 
   
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   I would like to propose a new put_opts call, in a similar vein to the existing get_opts. This would take a `PutOptions` similar to `GetOptions` and containing these predicates.
   
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   apache/arrow-rs#4754 would likely also benefit from a put_opts call
   


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