construct_analysis: Internal Methods for Constructing IMR Analyses
In Laksafoss/ICPSurv: Invariant Causal Prediction for Survival Data

An internal method used in the IMR for construction of the model analysis.

## Default S3 method:
construct_analysis(mc, data, ...)

## S3 method for class 'BS'
construct_analysis(mc, data, norder, knots, L, ...)

`mc`	the classes of the fitted models to be analyzed via the constructed analysis funciton.
`data`	data from the first fitted model.
`...`	additional arguments.

construct_analysis is a generic function. The methods should correspond to the inputted method in IMR.

An analysis constructor must return the following in a list

`analysis`	a function with exactly one input, `data`, which has the same format as the inputted `data`.
`method`	a method list with info used in the `plot.IMR` and `print.IMR` functions.