Switch integer values to int32

proto/caosdb/entity/v1alpha1/main.proto

@@ -90,7 +90,7 @@ message ScalarValue {
   // Wraps different optimized representations of a single value.
   oneof scalar_value {
     // The value as integer
-    int64 integer_value = 1;
+    int32 integer_value = 1;
     // The value as double
     double double_value = 2;
     // The value as bool