feat(expr): support jsonb_populate_map

[xxchan]

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What's changed and what's your intention?

#17743

Support converting jsonb -> map by jsonb_populate_map(map,jsonb)->map. (This is similar to #13421)

• Why not jsonb_to_map(jsonb)->map? Because we can't do the type inference (can't infer return type from the input type).
• Why not cast(jsonb) -> map? This seems OK, but might increase the complexity of type inference. Cast is a deep dark area.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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Documentation

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Release note

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[fuyufjh]

LGTM