[FLINK-33041][docs] Add an article to guide users to migrate their DataSet jobs to DataStream

[WencongLiu]

What is the purpose of the change

Add an article to guide users to migrate their DataSet jobs to DataStream.

Brief change log

• Add an article to guide users to migrate their DataSet jobs to DataStream.

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

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

[flinkbot]

CI report:

• 4884314 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[WencongLiu]

@flinkbot run azure

[yunfengzhou-hub]

Thanks for the PR. Left some comments as below.

[WencongLiu]

Thanks for the careful review of @yunfengzhou-hub . I've updated a round of changes. Please take a look when you have time. 😊

[yunfengzhou-hub]

Thanks for the update! Left some comments as below.

[yunfengzhou-hub]

Thanks for the update. Looks much better now. Left some comments as below.

@xintongsong Could you please take a look at this PR?

[yunfengzhou-hub]

Thanks for the update! LGTM overall except the idea to divide transformations into 4 categories.

[xintongsong]

@WencongLiu, thanks for addressing my comments. LGTM.

According to the contribution guidelines, please add an identical markdown file in content.zh/ and open a Jira ticket for the translation task.

[WencongLiu]

@WencongLiu, thanks for addressing my comments. LGTM.

According to the contribution guidelines, please add an identical markdown file in content.zh/ and open a Jira ticket for the translation task.

Thanks for the review! I have added an identical markdown file in content.zh/. I'll open a Jira ticket for the translation task after this pull request is merged.