sep_lasso_: Internal function that does the work of sep_lasso
In ebenmichael/ents: Maximum Entropy Synthetic Controls

Internal function that does the work of sep_lasso

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sep_lasso_(outcomes, metadata, trt_unit, by, scale = TRUE, maxep = 4,
  cols = list(unit = "unit", time = "time", outcome = "outcome", treated =
  "treated"))

`outcomes`	Tidy dataframe with the outcomes and meta data
`metadata`	Dataframe of metadata
`trt_unit`	Unit that is treated (target for regression)
`by`	Step size for tolerances to try
`scale`	Scale imbalances by standard deviations, default: True
`maxep`	Maximum imbalance to consider in units of sd, default: 4
`cols`	Column names corresponding to the units, time variable, outcome, and treated indicator