Overload HbaseIO with KV<RowKey, RowMutations>

[georgecma]

Add HbaseIO support for writing RowMutations (ordered by rowkey) to Hbase.
Fixes #25830

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[Abacn]

Thanks, the implementation looks good. Left comments about the added coder, and a couple of minor comments. In general, only IO connector classes need to be exposed as public. As for SDK, public class are meant to be used elsewhere and need to consider compatibility on changes.

[Abacn]

There are following warnings:

Bad practice Warnings
Code	Warning
FS	Format string should use %n rather than \n in org.apache.beam.sdk.io.hbase.HBaseSharedConnection.getDebugString()
Se	Class org.apache.beam.sdk.io.hbase.HBaseIO$WriteRowMutations defines non-transient non-serializable instance field configuration

this can be found by running ./gradlew :sdks:java:io:hbase:spotbugMain locally

[Abacn]

(Java_xxx_IO_Direct tests should report spotbug as Java_PreCommit. Add to my backlog for fix)

[georgecma]

Resolved issues

[Abacn]

Thanks, just have a couple of comments mostly the new coder implementation.

[Abacn]

Thanks! LGTM