Improve error messages

[hfrick]

Closes #191

This PR improves error messages for/from

• the survival helper cph_survival_pre()
• the glmnet check functions check_strata_nterms(), check_intercept_model(), and check_dots_coxnet()
• the glmnet fit wrapper coxnet_train()

by passing the call and

• removes the error for newdata from the glmnet predict methods since it now gets called in parsnip::predict.model_fit() which is called next
• updates the wording of the newdata error in the multi_predict() method for coxnet model to the wording now used in parsnip

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