Line Plot Widget for sequential data

Hi @dstansby , hi all,

I currently have a couple local implementations of a plotter with line plots based on metadata.
Data are stored in metadata because sometimes I generate data from intensity images which in napari, as far as I know, do not have 'properties' or 'features'.
I would like to have a general line plotter to import from. Thus, I naturally thought about napari-matplotlib!

To encompass all layer types, including the Image layer, I thought about storing the plotting data as a nested dictionary in the layer metadata, somtehing like:

{'plugin_name': 
    {'x_data': array},
    {'y_data': array},
    {'other_data': array} }`

I have some code that works with that kind of structure. Would that be an interesting contribution here?
From a plugin developer's perspective, storing data as a two level dictionary would allow filtering data origin (by 'plugin_name', so different plugins could fit) apart from regular image metadata and then axes would come from the internal keys. @kevinyamauchi , do you think such structure would be interesting?

Here is an example:

For example, for plotting a time series, a developer could include a time dimension array there as well.

If this should not belong here, that's also OK, I could place it somewhere else, just let me know ;)
I can make a Draft PR to further discuss this.

Best,
Marcelo

尚未確定任何檔案、測試或進入點。首先與維護者釐清提議的中繼資料結構和 widget 範圍；完成的標準是就如何在相關的 napari 圖層類型中繪製序列資料達成共識的實作計畫。