Block to cpu move to _execute_section_block

[dkazanc]

This moves block.to_cpu() from writing doing the transfer in dataset_store, which doesn't seem the right place. I've added some logic around how to recognise that the block needs to be moved. Also to be able to clock with the monitor the device to host transfer time.
The resulting csv file reflects the intended behavior. Few tests to fix.

Checklist

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have made corresponding changes to the documentation

[dkazanc]

@yousefmoazzam I think it is ready but I couldn't get my head around one last failing test: test_execute_section_for_block. Can you have a look please? cheers