[FEA] Create a function to CRE Gather Stack process

[Dirack]

🎉 Feature request

Is your feature request related to a problem? Please describe.

The CRE Gather Stack process is done in a loop for each experiment and could be generalized in a function inside a Madagascar Recipe.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.