Bulk CSV importer

Create a Bulk Action that imports a CSV file.

The idea is to leverage the Bulk Service to

• provide reliable import (retry, survive cluster restart ..)
• distribute the import process
• get a progress status & rest API

What needs to be done:

• Since NXP-28334 we can contribute a scroller, just create a FileSplitScroller implementation that takes a file or file path as input and split the content in chunks of lines, reporting the total number of lines
• A simple processor with a single CSV import computation receive a batch of CSV lines and create documents

Now if you are able to create documents using the same CSV format that is produced by the CSV Export you have a basic document export/import for free.