[enh] add support for display window in meta.json

[chourroutm]

As I have understood that voluba is shifting from transform.json (affine transform) to meta.json (which can ship extra display metadata), adding a key-value pair for the display window would ease the process of sharing voluba-integrated datasets.

[xgui3783]

can you provide an example?

e.g. at the moment, the following meta.json is defined by the proposal. Whilst not all keyvalue are evaluated at the moment, we plan to do so in the medium term future.

GET /meta.json

{
    "version": 1,
    "preferredColormap": ["magma", "plasma", "greyscale"],
    "transform": [...4x4 affine, trimmed for brevity ...],
    "data": {
        "type": "image/1d",
        "range": [{
            "min": 0.2222,
            "max": 0.2233
        }]
    }
}

edit: maybe similar to FZJ-INM1-BDA/siibra-explorer#1273 ?

[chourroutm]

Of interest for #198: does it mean display range or the boundaries of the histogram?

Originally posted by @chourroutm in FZJ-INM1-BDA/siibra-explorer#1348 (comment)