Inconsistent order of OnWrite/Editable calls for regular fields and for batch fields

### Description

For regular fields:
```c#
Field(unit => unit.Name)
.Editable()
.OnWrite((ctx, entity, value) => { });
```
For batch fields:
```c#
Field("name")
.FromBatch(entities => entities.ToDictionary(entity => entity, entity => entity.Name))
.OnWrite((ctx, entity, value) => { })
.Editable();
```

### Describe the solution you'd like

For both regular and batch fields order of calls `OnWrite` and `Editable` should be the same.