HBASE-27190 Add some docs about exporting and importing snapshots using Aliyun object storage service(OSS)

[wujinhu]

Aliyun Object Storage Service(Aliyun OSS) is widely used, particularly popular among China’s cloud users, and it provides cloud object storage for a variety of use cases. Hadoop file system supports OSS since version 2.9.1. Now, we can export and import snapshots using Aliyun object storage service(OSS).

Jira: https://issues.apache.org/jira/browse/HBASE-27190

[Apache-HBase]

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GITHUB PR	#4612
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