Add custom outputs (prophet model and input) to InputCollect

[sallyhong]

Summary

I forked the Robyn repo and added some extra lines of code to be able to

• Pull the prophet model
• Pull the prophet input data

This is accessed as

# For the actual model
InputCollect$prophet_custom_output$prophet_model

# For the prophet input (just for debugging purposes to see what went into the model
InputCollect$prophet_custom_output$prophet_input

How to actually use the modified code will be shown in a separate PR :)

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[gufengzhou]

Hi, sorry this won't work because:

• you cannot just change the returned object in robyn_input without correcting for all downstream usages. At the point we don't encourage this.
• You left your personal comments in the PR
• You're missing the CLA
• Moreover, custom output is based on what you provide as custom input for prophet. I don't see a strong use case for this.