`preview_sample_rows` for Input Plugins
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Description
Embulk has had a configuration `preview_sample_rows` for preview. It seems like a top-level configuration with preview.
https://github.com/embulk/embulk/blob/v0.11.0/embulk-core/src/main/java/org/embulk/exec/PreviewExecutor.java#L32-L58
It just affects `SamplingPageOutput` when printing the preview result.
https://github.com/embulk/embulk/blob/v0.11.0/embulk-core/src/main/java/org/embulk/exec/PreviewExecutor.java#L126-L140
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On the other hand, we sometimes wanted to limit the input side especially when the input is potentialy so large. We received a feedback for the JDBC Input Plugins.
https://github.com/embulk/embulk-input-jdbc/pull/251
We may want to consider how we can limit the input in preview from global configurations.
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