import into: auto detect data source format

[River2000i]

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What is changed, added or deleted? (Required)

pingcap/tidb#59543

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For details, see tips for choosing the affected versions (in Chinese).

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

• This PR is translated from:
• Other reference link(s): IMPORT INTO autodetect file format and wildcards for file path docs#21197

Do your changes match any of the following descriptions?

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

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[ti-chi-bot]

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[ti-chi-bot]

Hi @River2000i. 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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