Add option to save default data editor layout

[solth]

Is your feature request related to a problem? Please describe.
Layout settings in the metadata editor can be saved for individual tasks using this button:

This allows users to adjust the editor for different purposes - e.g. the gallery could be hidden for tasks configured to enter metadata while the structure tree is not displayed in QC tasks where the user only wants to inspect the quality of the images - and save those customized layouts for individual tasks. The saved layouts will then be applied whenever the user opens the metadata editor with a process created by the same workflow via the same task in the future.

It is not possible to save the current layout of the editor when opening a process via the process list, though. In that case the button mentioned above is deactivated:

Describe the solution you'd like
The option to save the current column width distribution and metadata editor layout should also be available when opening a process via the corresponding action in the process list, thus not in relation to any particular task. The layout should then be considered to be saved as a "general default layout" of the editor for the user, that will always be applied when either opening the metadata editor via the process list or when opening it via the details page of a specific task for which no task-specific layout has been saved.

Additional context
This topic has been discussed at the Kitodo community meeting 2023 and has been documented at #5881 and https://github.com/kitodo/kitodo-production/wiki/Barcamp-2023:-Usability-Metadateneditor