refactor: ast.Call should be in main task package (#2084)

call.go

@@ -0,0 +1,11 @@
+package task
+
+import "github.com/go-task/task/v3/taskfile/ast"
+
+// Call is the parameters to a task call
+type Call struct {
+	Task     string
+	Vars     *ast.Vars
+	Silent   bool
+	Indirect bool // True if the task was called by another task
+}