Allow the ability for multiple transformers to write to the same table

[yruslan]

Background

This is useful, when the transformation logic differs, say, on the day of week.

Feature

Allow the ability for multiple transformers to write to the same table.

Proposed Solution

• The dependency resolution logic should mark a table as available only after all transformers that write to it are finished and successful.
• Validation should be added to ensure multiple transformers do not write to the same partition.