Add GoldParse.resize_arrays method

spacy/gold.pyx

@@ -592,6 +592,16 @@ cdef class GoldParse:
         """
         return self.length
 
+    def resize_arrays(self, int new_size):
+        # These are filled by the tagger/parser/entity recogniser
+        self.c.tags = <int*>self.mem.realloc(self.c.tags, new_size * sizeof(int))
+        self.c.heads = <int*>self.mem.realloc(self.c.heads, new_size * sizeof(int))
+        self.c.labels = <attr_t*>self.mem.realloc(self.c.labels, new_size * sizeof(attr_t))
+        self.c.has_dep = <int*>self.mem.realloc(self.c.has_dep, new_size * sizeof(int))
+        self.c.sent_start = <int*>self.mem.realloc(self.c.sent_start, new_size * sizeof(int))
+        self.c.ner = <Transition*>self.mem.realloc(self.c.ner, new_size * sizeof(Transition))
+        self.c.fused = <int*>self.mem.realloc(self.c.fused, new_size * sizeof(int))
+
     @property
     def is_projective(self):
         """Whether the provided syntactic annotations form a projective