#1318 functional test for usages of Schema mapper

[naleeha]

• Added vuu.util.schema.SchemaMapperFunctionalTest for in memory table use case
• Started vuu.feature.igniteSchemaMapperFunctionalTest for virtualised table usecase - work in progress
• Added vuu.util.schema.SchemaMapperJavaFunctionalTest to show Java usecase & ensure our api cater for it.
• Introduced helper functions such as ColumnBuilder to enable current Scala API usage in both Java & Scala
• Introduced Java helper function to interop with Scala with more ease ScalaCollectionConverter, ScalaList

This is working progress, merging to avoid having long running branch.

Raised new issue for Outstanding tasks https://github.com/finos/vuu/issues/1370

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