genie_python: area detector aware

As a scientists I wouldlike to be able to access the "area detector" like DAE information as used by live view, this would help with experiments and aligning on e.g. reflectometry

## Acceptance Criteria

- able to access and manipulate array of all spectra in genie python with acceptable performance

## Notes

- would epics v4 help here
- also what about mantid etc.