function naming and reorganization

[judithabk6]

the file benchmark_mediation should be renamed mediation

Should we include mediation in all function names or just assume it's ok as they are in the mediation module?

• [ ] plain_IPW : to move elsewhere, not a mediation estimator
• [ ] AIPW : same
• [ ] huber_IPW -> mediation_IPW
• [ ] ols_mediation -> mediation_coefficient_product
• [ ] g_computation -> mediation_g_formula
• [ ] alternative_estimator : not used, looks like the mediate function in the mediation package in R
• [ ] multiply_robust_efficient -> multiply_robust
• [ ] r_mediate
• [ ] g_estimator -> r_g_estimation
• [ ] bart : to move elsewhere or remove (not a mediation estimator)
• [ ] medDML : r_medDML
• [ ] med_dml : medDML or DML or mediation_DML

_convert_array_to_R and get_interactions : should be moved to a utils module?

[bthirion]

for plain_IPW, AIPW, (+bart) maybe add a treatment_effect module ?

[houssamzenati]

this has tentatively been addressed in PR #58