Saving an unfilled copy of the annotations

[Marcel-Mueck]

with these changes, a copy of the annotations.parquet file is saved containing NA values before filling these

What

This change will add the option --keep_unfilled to the select_rename_fill_annotations function in deeprvat_annotaions , which saves a copy of the annotations data frame before filling in any NA values to the data frame.

Testing

• the test pipeline was successfully run with the changes,
• test cases with the unfilled option were created to run automatically

Test scenarios

• select_rename_fill function with --keep-unfilled option (test case exists, run automatically on example data)
• select_rename_fill function without --keep-unfilled option (test case exists, run automatically on example data)
• updated pipline which uses the --keep-unfilled option (tested locally on example data)

[meyerkm]

LGTM