Input check

[judithabk6]

• addresses Failing estimators with input shape (n,1) #75 implement an input checker for all estimators #57 need to correct IPW code for y and t input format #14 m.astype(int) for multiply_robust #41
• implementation of an input checker for all estimators
• adding ravel of m when needed
• removes the xfail of the test_robustness_to_ravel format (

  med_bench/src/tests/estimation/test_get_estimation.py

  Line 257 in 4ebee9c

  def test_robustness_to_ravel_format(data, estimator, config, effects_chap):

  )

still a draft (I know there are commented lines to remove or this sort of things), I have issues with

• exact tests, not sure why
• maybe it is the occasion to deal with the reshapes in the src/med_bench/utils/nuisances.py file (need some input on how it should be done @houssamzenati)

I open the PR to discuss if the main direction is ok for everyone