internal/rosa/package: migrate python packages

This also migrates LLVM LIT via the newly implemented special case.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/state.go

@@ -451,6 +451,30 @@ func (s *S) getFrame() azalea.Frame {
 				return
 			}},
 
+			k("split"): {F: func(
+				args azalea.FArgs,
+			) (v any, set bool, err error) {
+				var p, sep string
+				var n int64
+				if err = args.Apply(map[unique.Handle[azalea.Ident]]any{
+					k("s"):   &p,
+					k("sep"): &sep,
+					k("n"):   &n,
+				}); err != nil {
+					return
+				}
+
+				if n < 0 {
+					n = 0
+				} else if n == 0 {
+					n = -1
+				}
+
+				v = strings.SplitN(p, sep, int(n))
+				set = true
+				return
+			}},
+
 			// intenral/pkg built-ins
 
 			k("remoteTar"): {F: func(