[bugfix] deprecate batch interface setIsAtomic and modify releated test cases

[GroundWu]

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Summary

Deprecate the batch setIsAtomic interface and the batch operation is atomic now. Atomic means: If one of the operation in a single-partition batch request execute failed, it will rollback and return error code.

Solution Description

• Deprecate the batch setIsAtomic interface
• Modify atomic-related test case

[IHEII]

Let us modify the demo and readme to indicate to users that we can't ensure atomicity when they are using batch operation across tablets/partitions.

[GroundWu]

Let us modify the demo and readme to indicate to users that we can't ensure atomicity when they are using batch operation across tablets/partitions.

Across partitions is not supported when use batch operation, and it will throw ObTablePartitionConsistentException when user do that. Add demo and readme in following files:

• example/simple-table-demo/README.md
• example/simple-table-demo/src/main/java/com/oceanbase/example/SimpleTableDemo.java