[apache/incubator-mxnet] [RFC] MXNet 2.0 JVM Language development (#17783)

[Lanking]

Since MXNet 2.0 development starts. I would like to initiate a discussion for 
the future development of JVM languages.

## Proposal
- Start cleaning on the existing APIs to adapt to 2.0
- Start from ground up to rewrite the whole Scala/Java APIs
- Start using DJL (djl.ai) as a frontend for MXnet JVM development
- Using DJL MXNet JNA to write MXNet custom frontend
- (Feel free to add more...)

## Statistics

### Scala package
![scala-mxnet](https://user-images.githubusercontent.com/340299/76096507-3b206a00-5f94-11ea-839a-168fb923a59d.png)

### Clojure package
![clojure-mxnet-downloads](https://user-images.githubusercontent.com/340299/76096528-41164b00-5f94-11ea-8313-5bfbc97ff689.png)

@gigasquid @terrytangyuan @zachgk @frankfliu @aaronmarkham 

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