add new pytest_handlecrashitem hook

allows handling and rescheduling crash tests

PR #651

Co-authored-by: xoviat <xoviat@users.noreply.github.com>
Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>

src/xdist/scheduler/load.py

@@ -151,6 +151,14 @@ class LoadScheduling:
         self.node2pending[node].remove(item_index)
         self.check_schedule(node, duration=duration)
 
+    def mark_test_pending(self, item):
+        self.pending.insert(
+            0,
+            self.collection.index(item),
+        )
+        for node in self.node2pending:
+            self.check_schedule(node)
+
     def check_schedule(self, node, duration=0):
         """Maybe schedule new items on the node