docs: add three usecase for flow

[discord9]

What's Changed in this PR

Describe the change in this PR

as title

• Apply review suggestions
• waiting for: perf(flow): use batch mode for flow greptimedb#4599
• All codes can be executed correctly(now on main a3d567f)
• Translate to zh

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[cloudflare-workers-and-pages]

Deploying greptime-docs with    Cloudflare Pages

Latest commit:	94eee85
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Branch Preview URL:	https://flow-3-usecase.greptime-docs.pages.dev

View logs

[nicecui]

There is one remaining issue: the example in the Write a Query document isn't suitable, please modify it, or use a example in this document instead.

[nicecui]

please add the new markdown file to sidebar.ts: https://github.com/GreptimeTeam/docs/blob/main/CONTRIBUTING.md#adding-a-new-document

[fengjiachun]

Let's start writing the Chinese document. @discord9

[nicecui]

please remember to improve the zh docs after the AI translation, thanks

[nicecui]

waiting for: GreptimeTeam/greptimedb#4599

[fengjiachun]

LGTM