add parametric model from survivalmodels (#345)

* add implementation of parametric from survivalmodels

* fix param test

* small fixes, better doc, rename 'type' parameter to 'form'

* update parametric learner tests

* update NEWS.md

* update doc

* fix styling

* fix another styling issue

DESCRIPTION

@@ -101,7 +101,7 @@ Suggests:
     sm,
     stats,
     survival,
-    survivalmodels,
+    survivalmodels (>= 0.1.19),
     survivalsvm,
     tensorflow (>= 2.0.0),
     testthat,
@@ -122,5 +122,5 @@ Config/testthat/edition: 3
 Encoding: UTF-8
 NeedsCompilation: no
 Roxygen: list(markdown = TRUE, r6 = TRUE)
-RoxygenNote: 7.2.3.9000
+RoxygenNote: 7.3.1.9000
 Config/Needs/website: rmarkdown

NEWS.md

@@ -1,5 +1,6 @@
 # mlr3extralearners 0.7.1-9000
 
+* Ported `surv.parametric` code to `survivalmodels`, changed `type` parameter to `form` to avoid conflict with survivalmodels's default parameter list
 * Fix: Replace hardcoded `VectorDistribution`s from partykit and flexsurv survival learners with survival matrices (`Matdist`) (thanks to @bblodfon)
 * Feat: Add `discrete` parameter in `surv.parametric` learner to return `Matdist` survival predictions
 * Added method `selected_features()` to CoxBoost survival learners (thanks to @bblodfon)