Create Xspress FrameProcessor adapter controller with scalar chunk / batch size

[GDYendell]

We want to be able to set the batch size in the xspress fp plugin and the outer chunk dimension of all N mca datasets to the same value. This will require creating a subclass of FrameProcessorAdapterController with the new attribute using ConfigFanOutAttributeIO and then create an OdinController child class that creates this xspress subclass for the fp adapter.

Add a method that takes the chunk size and for each mca dataset that exists at runtime, creates a chunk vector of [chunk_size, *<dimensions>] and calls self.connection.put(<chunks>, <vector>. Call chunk_size.add_on_update_callback (ref) with this method, so that it is called every time the

Acceptance Criteria

• Can set the above parameters from one fan out attribute on FP screen