Add embedded option

[tchlyah]

Hello guys,

Following https://github.com/jhipster/generator-jhipster/issues/7944 and https://github.com/jhipster/generator-jhipster/pull/9341 for supporting rich document models on document databases (MongoDB and Couchbase), I added a new embedded option that enables subdocuments as explained here : https://github.com/jhipster/generator-jhipster/issues/7944#issuecomment-419755147

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[MathieuAA]

By the way, is the embedded option in the entity JSON file mandatory? What happens when the option isn't there? I guess the default value is false right?

[tchlyah]

Yes, it is not mandatory, the default value will be false as you said