Add EXPLAIN and EXPLAIN EXTENDED query analysis tools#11

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rocknroll17 wants to merge 5 commits intoMariaDB:mainfrom

rocknroll17:feature/explain

Commits on Jul 1, 2025

feat: make embedding services optional
rocknroll17
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Commits on Jul 3, 2025

Commits on Jul 4, 2025

chore:Modified some comments
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