Add as_any() to the ObjectStore to make it able to identify which ObjectStore is using for the related trait object

[yahoNanJing]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

The context is we are working on introducing a data source cache layer for Ballista & DataFusion apache/datafusion-ballista#645. The cache layer will be able to multiple ObjectStore data. And we need to leverage the identification of the ObjectStore.

Describe the solution you'd like

Add as_any() to the ObjectStore to make it able to identify which ObjectStore is using for the related trait object.

Describe alternatives you've considered

Additional context

[tustvold]

And we need to leverage the identification of the ObjectStore.

Could you expand a bit on what you mean by this, why does the cache need to know the backing implementation? Surely this is an encapsulated detail?