Make it easier to register object stores

[alamb]

Came up in #9280

The problem is that when trying to use urls in ListingTables (or ParquetExec), if you try with a scheme like file:// it won't work unless you have registered an object store handler

However, the current user experience is bad -- the error message is mysterious and confusing and it is not obvious how to register the correct listing table

"Error: Internal("No suitable object store found for file://")"

I would recommend two things:

Suggestion 1: Change the error message

Change the error message to include instructions on how to fix the issue

For example, instead of

No suitable object store found for file://

Perhaps it could be something more like

No object store registered for url scheme 'file://'. See RuntimeEnv::register_object_store

Suggestion 2: Add an example to the docs

Once the error message directs to RuntimeEnv::register_object_store then it would be ideal if the docs

https://docs.rs/datafusion/latest/datafusion/execution/runtime_env/struct.RuntimeEnv.html#method.register_object_store

actually had an example

So that would perhaps take the form of adapting the example above as a doc example

Does that make sense?

Originally posted by @alamb in #9280 (comment)

[aditanase]

@alamb sent a quick PR - let me know if you were thinking of more than this. Thanks for the pointers!

[alamb]

Thanks again @aditanase 🙏