[FLINK-23229][docs-zh] Translate "Timely Stream Processing" page into Chinese

[RollsBean]

What is the purpose of the change

This pull request transalte "Timely Stream Processing" page into Chinese. Doc lInk: https://ci.apache.org/projects/flink/flink-docs-release-1.13/zh/docs/concepts/time/, JIRA ticket: https://issues.apache.org/jira/projects/FLINK/issues/FLINK-23229

Brief change log

• Translate file into Chinese in docs/content.zh/docs/concepts/time.md

Verifying this change

(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:

• 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: (no)
• 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 / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit 787b2d3 (Mon Aug 02 05:52:41 UTC 2021)

Warnings:

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CI report:

• 787b2d3 Azure: SUCCESS

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