Bringing back the context switch

[oxabz]

Problem

I'm working for Toulouse's CHU and need the context switch to implement Cohort360 for Toulouse

Additional context

The context switch that used to exist didn't work due to tree shaking.
Any environment variable used to determine a switch or if/else shouldn't use the placeholder string method.

Implementation

• add the index
• create the switch
• change the imports to the 'service' path
• I would be interested in implementing this feature.