[FLINK-35628][docs] Provide a Chinese translation of datagen.md

[BigDataMao]

What is the purpose of the change

Provide a Chinese translation of datagen.md

Verifying this change

Please make sure both new and modified tests in this PR follow the conventions for tests defined in our code quality guide.

• Yes

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• None

Documentation

• None

[flinkbot]

CI report:

• a4628798c5b519978dd73878fcae2278d7b0b5c2 Azure: FAILURE

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[hlteoh37]

Looks good. Could we squash the commits to have a single commit with name [FLINK-35628][docs] Provide a Chinese translation of datagen.md?

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