Henry Baba-Weiss

slowlog, stmtsummary: include the storage engine(s) a query read from

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Issue Number: close #61736 Problem Summary: For deployments involving both TiKV and TiFlash, it's not easy to identify the queries from TiFlash in slow query logs, which makes troubleshooting inconvenient...

stmtsummary: change `plan_hint` column type to `text`

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### What problem does this PR solve? Issue Number: close #56057 Problem Summary: The `plan_hint` column type is currently a `VARCHAR(64)`, but plan hints are not limited to 64 characters...

include storage engines in slow query logs and statements summary

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### First-time contributors' checklist - [x] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) Document extra...