Implement low-level API about pluto

[bgchun]

@DifferentSC @TaeHunKim Could you create separate issues?
For example, even for the first item, you need to define a generic interface, and implement multiple input methods: NCS, pub-sub (e.g., Kafka), and file (e.g., HDFS). You need at least four issues.

[DifferentSC]

Sure. I'll make those issues.

[bgchun]

@DifferentSC @TaeHunKim Since I explained concrete issues to create for input, can you create issues for query processing and output by yourself?

[DifferentSC]

I've created issues for those things.

[DifferentSC]

This issue has been outdated and should be processed in MIST Task.