evaluate_trt_spec_pmf_eif: Get a matrix of eif estimates for treatment-specific PMF
In drord: Doubly-Robust Estimators for Ordinal Outcomes

Get a matrix of eif estimates for treatment-specific PMF

evaluate_trt_spec_pmf_eif(
  trt_spec_pmf_est,
  trt_spec_prob_est,
  trt_level,
  treat,
  out,
  out_levels
)

`trt_spec_pmf_est`	Estimated conditional PMF for `trt_level`.
`trt_spec_prob_est`	Estimated propensity for `trt_level`.
`trt_level`	Treatment level
`treat`	A `numeric` vector containing treatment status. Should only assume a value 0 or 1.
`out`	A `numeric` vector containing the outcomes. Missing outcomes are allowed.
`out_levels`	A `numeric` vector containing all ordered levels of the outcome.