include storage engines in slow query logs and statements summary

[henrybw]

First-time contributors' checklist

• [x] I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Document extra attributes added to identify the storage engine in both the statement summary and slow query log.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• [x] master (the latest development version)
• [ ] v9.0 (TiDB 9.0 versions)
• [ ] v8.5 (TiDB 8.5 versions)
• [ ] v8.4 (TiDB 8.4 versions)
• [ ] v8.3 (TiDB 8.3 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)

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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

[pingcap-cla-assistant[bot]]

All committers have signed the CLA.

[Oreoxmt]

@henrybw Could you please invite a tech reviewer? Thanks!

[ti-chi-bot[bot]]

@terry1purcell: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

/lgtm

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-07-18 03:39:15.173941673 +0000 UTC m=+2835007.897120656: :ballot_box_with_check: agreed by Oreoxmt.
• 2025-07-18 08:13:40.83625222 +0000 UTC m=+2851473.559431203: :ballot_box_with_check: agreed by qiancai.

[Oreoxmt]

/approve

[Oreoxmt]

/unhold

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

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