Add docs and examples for object_store_opendal #4599
Description
object_store_opendal has been used by some users but we don't have a doc page for it. We need to improve this part.
related to: apache/arrow-rs#5752 (comment)
Tasks
- Add a README for this project, including
- What's this project for
- How to build/test/use this project
- Examples
- Example for object_store
- Example for datafusion
- Example for polars
- Example for delta-rs