[Rspamd] Add neural module and define its scores

data/conf/rspamd/local.d/neural_group.conf

@@ -0,0 +1,18 @@
+symbols = {
+  "NEURAL_SPAM_LONG" {
+    weight = 4.2; # sample weight
+    description = "Neural network spam (long)";
+  }
+  "NEURAL_HAM_LONG" {
+    weight = -4.0; # sample weight
+    description = "Neural network ham (long)";
+  }
+  "NEURAL_SPAM_SHORT" {
+    weight = 3.0; # sample weight
+    description = "Neural network spam (short)";
+  }
+  "NEURAL_HAM_SHORT" {
+    weight = -2.0; # sample weight
+    description = "Neural network ham (short)";
+  }
+}