Improve RCR initialization script to handle coupled 0D files

Problem

Currently, the Python script in the utilities folder that initializes pressures with an analytical solution takes as input only the .xml file: https://github.com/SimVascular/svMultiPhysics/tree/main/utilities/initialize_rcr_boundary_conditions

Users with coupled .json files (that can contain both the inflow and RCR information) need to convert the information to the .xml file.

Solution

I will update the script to handle inflow and RCR information from the coupled .json file. Since the original script assumes the same initial pressure across all outlets, and the current 0D-3D interface implementation takes in only one <Initialize_pressure> block, this should be a minor fix.

Additional context

No response

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