tikv: add new dynamic configure for flow-control (#18814)

[ti-chi-bot]

This is an automated cherry-pick of #18814

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• This PR is translated from: tikv: add new dynamic configure for flow-control docs-cn#18540
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[ti-chi-bot]

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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the TiKV documentation by adding new dynamic configuration options related to storage flow control. This change enables administrators to modify critical flow control parameters on the fly, without requiring a cluster restart, thereby improving operational flexibility and responsiveness to system load.

Highlights

• Dynamic Configuration Documentation: I've updated the dynamic-config.md file to include new storage.flow-control parameters, making them visible as dynamically configurable options for TiKV.
• Flow Control Parameters: The added parameters allow for dynamic adjustment of TiKV's flow control mechanism, including enabling/disabling it and setting thresholds for memtables, L0 files, and pending compaction bytes.

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[gemini-code-assist]

Code Review

This pull request adds several new dynamic configuration items for TiKV flow control to the documentation. My review focuses on ensuring the changes adhere to the documentation style guide. I've suggested a formatting correction to enclose the new configuration items in backticks for consistency and improved readability, and also made minor wording adjustments for conciseness.

[glorv]

LGTM

[ti-chi-bot]

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