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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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):
  syncer(dm): option for explicit auto-id-cache handling in create table DDLs tiflow#12040

Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[ti-chi-bot]

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[ti-chi-bot]

Hi @michaelmdeng. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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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?

[hfxsd]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[hfxsd]

Hold as code is not merged yet.