v3.3.0: Add support for remote region metastores and alluxio cache (#82)

* hive site xml env variable

* fix

* fix

* fix

* variable to enable path conversion hook

* fix

* fix

* update metastore filter hook class

* remote region endpoints

* fix

* remote region provider

* provider_proxy

* fix

* remote region federation

* fix

* fix

* enable path replacement

* support for multiple alluxio endpoints

* fix

* fix

* fix

* fix

* update readme

* update changelog

* fix

* enable path conversion by default for remote region metastores

* Update README.md

Co-authored-by: Scott Barnhart <[email protected]>

* PR comment updates

* update readme

* more PR comment updates

Co-authored-by: Raj Poluri <[email protected]>
Co-authored-by: Scott Barnhart <[email protected]>