feat: expose PK info in index system catalog

[yezizp2012]

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What's changed and what's your intention?

Resolve #17252 .

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[neverchanje]

Respect 🫡

[yezizp2012]

The reason why I didn't add the PK info into rw_indexes is that all records in it are also treated as streaming jobs when it's used by other system views, which is error-prone.