Java example: verify-checksum

[zhangjinpeng87]

What problem does this PR solve?

Add a java example to show how does downstream java app handle the row-level checksum. Java version of https://github.com/pingcap/tiflow/blob/master/examples/golang/avro-checksum-verification/main.go

Issue Number: close https://github.com/pingcap/tiflow/issues/10030

What is changed and how it works?

Check List

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

PR needs rebase.

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