Go: Add upgrade and downgrade scripts

Author: jketema

go/downgrades/5ff5325d274ae4f86defa195577bc7c1370b72fa/go.dbscheme

@@ -0,0 +1,15 @@
+class TypeParamType extends @typeparamtype {
+  string toString() { none() }
+}
+
+class CompositeType extends @compositetype {
+  string toString() { none() }
+}
+
+class TypeParamParentObject extends @typeparamparentobject {
+  string toString() { none() }
+}
+
+from TypeParamType tp, string name, CompositeType bound, TypeParamParentObject parent, int idx, boolean is_from_recv
+where typeparam(tp, name, bound, parent, idx, is_from_recv)
+select tp, name, bound, parent, idx

go/downgrades/5ff5325d274ae4f86defa195577bc7c1370b72fa/old.dbscheme

@@ -0,0 +1,3 @@
+description: Track whether a type parameter is from a receiver
+compatibility: partial
+typeparam.rel: run typeparam.qlo