Dynamically load LocationProvider implementation

[jackye1995]

Currently the LocationProviders class only load either DefaultLocationProvider which follows the Hive standard or the ObjectStoreLocationProvider that is optimized for cloud storage use case. Use cases like #1531 will become increasingly common, and we should allow users to load their custom location providers without the need to change core package.

Therefore, I propose dynamically loading the LocationProvider implementation in the method LocationProviders.locationsFor and use new table property write.location-provider.class to determine the class. Table property write.object-storage.enabled will still be supported to keep backwards compatibility.

Plan to submit a PR in 1-2 days, please let me know if there is any concern, thanks.

[mickjermsurawong-stripe]

This PR #1531 was re-purposed from solving specific problem of data localization to address this more general use case.