Add support for ElementCollection with Kudu

[white777777]

Is that possible with columnar storage manager?

[devender-yadav]

Embeddables and EmbeddedId are supported. Details - https://github.com/Impetus/Kundera/wiki/Embeddables-support-in-Kudu

I don't think ElementCollection is supported yet. But Kundera kudu is an easier module to start with. Feel free to contribute.

-Devender