Discover backend/frontend updates and fixes for DECI

cleanup onnx export not used in the backend anymore
updating DECI default parameters (slower to run but produces more accurate results)
fix DAG detection in the backend
updating default confidenceThreshold to 0.5
update DECI backend to use name_to_idx from causica
remove unused interpret_boolean_as_continuous from DECI backend
round filtered adjacency matrix for DECI interventions backend
updating mean/std normalization of continuous variables to be optional on discover
updating ATE calculation on discover backend and preparing code to handle categorical variables
DECI intervention backend updates
updating interventions backend to properly handle thresholds
updating interventions threshold filtering to use numpy
apply discover app linting suggestions
configuring intervention model to expire after some time on redis

microsoft / showwhy