tiproxy: add performance report of traffic capture (#18974)

[ti-chi-bot]

This is an automated cherry-pick of #18974

What is changed, added or deleted? (Required)

• Some community users gave feedback that they wanted the performance effect of traffic capture, so I did a performance test.
• Meanwhile, a colleague wanted to see the sample of fail, so I added a sample.
• Added more warnings as the PM required.
• Fix wrong name of db tiproxy_traffic_replay.

Which TiDB version(s) do your changes apply to? (Required)

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• master (the latest development version)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

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Do your changes match any of the following descriptions?

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

[Oreoxmt]

/approve

[ti-chi-bot]

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