dm: add auto-id-cache-size config

[michaelmdeng]

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What is changed, added or deleted? (Required)

Add documentation for new auto-id-cache-size config in DM syncer from pingcap/tiflow#12040

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• [ ] v9.0 (TiDB 9.0 versions)
• [ ] v8.5 (TiDB 8.5 versions)
• [ ] v8.4 (TiDB 8.4 versions)
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• [ ] v5.4 (TiDB 5.4 versions)

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• Other reference link(s): https://github.com/pingcap/tiflow/pull/12040

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• [ ] Delete files
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• [ ] Might cause conflicts after applied to another branch

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[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

Hi @michaelmdeng. Thanks for your PR.

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[lilin90]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.You have signed the CLA already but the status is still pending? Let us recheck it.

Could you please sign the CLA?