Callbacks: file-writing (machine-readable files)

[Tom-Willemsen]

As a user/developer I would like the results of a scan to be preserved in a useful long-term scientific storage format.

Note: human-facing .txt files are being handled by #7 , but that will not necessarily contain all of the data, for example:

• Numbers will be formatted to the specified precision for human-readability
• Missing arrays
• etc

This issue is to ensure the full/raw data is accessible in a scientist-facing way via standard file formats (e.g. HDF5 or similar).

bluesky already has support for this via databroker & suitcase - suitcase has plugins for various popular file formats including e.g. HDF5 that are suitable for long-term storage of bluesky scans data in an efficient machine-readable format that can handle all of bluesky's data types.

[LowriJenkins]

When we come to do this ticket, we need to consider data storage locations, as the current solution is not suitable for neutron data.