Add support for S3 Region

[majetideepak]

Description

We will follow the Hadoop aws library rules to be consistent with other applications. These rules seem reasonable.
https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/connecting.html#s3_endpoint_region_details

1. Configs hive.s3.endpoint and hive.s3.endpoint.region are used to set values for S3 endpoint and region respectively.
2. If hive.s3.endpoint.region is configured with valid AWS region value, S3FS will use this value.
3. If hive.s3.endpoint.region is not set and hive.s3.endpoint is set with valid endpoint value, S3FS will attempt to parse the region from the endpoint and configure the client to use the region value.
4. If both hive.s3.endpoint and hive.s3.endpoint.region are not set, S3FS will use us-east-2 as default region and enable cross-region access. In this case, S3FS does not attempt to override the endpoint while configuring the S3 client.