Add Increment/Append support to RowMutations

<!-- markdown --> After HBASE-25242 , we can add Increment/Append operations to RowMutations and perform those operations atomically in a single row. This change alters a public API so that the `mutateRow` method in both the `Table` and `AsyncTable` classes now returns a `Result` object with the result of the passed operations. Previously these methods had no return values. Code that calls these methods which was compiled against an earlier version of the HBase client libraries will fail at runtime with a `NoSuchMethodError` when used with this release. If you are going to ignore the result of the passed operations you can simply recompile your application with an updated dependency and no additional changes.