Support conditional file processing based on previous task output

[Nina-mvH]

This would be relevant in situations like the following:

• I have a directory of input files (lets say text inputs)
• I want to run a task which will include a T/F outputs (ie. a chat task outputting JSON with a T/F field0
• Given the JSON outputs from the previous task, I want to run a second task which takes the original text files as input, but only if they were determined True from the previous outputs. In other words, I want this task to run on a subset of the original input files with the previous task determining the subset.

It would be nice to be able to specify this somehow in the config

task1
     input: .txt
     output: .json
     ...
task2:
     # No depends_on field
     input: .txt #points to same directory as task1
     subset: 
          - depends_on: task1
          - condition: [field] is True