Allow raw-to-raw transformers that do not copy files and rely on transformers themselves outputting files to the target directory

[yruslan]

Background

Currently, when the output table of a transformer has 'raw' format, the transformer is expected to return the list of files top copy. But sometimes this results in redundant copy operations.

Feature

Allow raw-to-raw transformers that do not copy files and rely on transformers themselves outputting files to the target directory.

Example [Optional]

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Proposed Solution [Optional]

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