send a timestamp for each data chunk and show delta in UI

[spq]

WiP, fixes #79

how should the UI show the timestamps/the time diff?

[peace-maker]

Tulip has cards separating every stream chunk, which allows to add more metadata per chunk too.

caronte does something similar, but only shows the timestamp instead of difference to the previous chunk.

I don't see how we can add this context to the inline ascii view, so I'd say we add a card view too where we can add more metadata to each chunk.

[peace-maker]

I've drafted an UI which shows the time difference between the chunks. We can add an option to change the viewmode to the old inline representation too, but I've hardcoded the parameter to the new mode for now.

The splitting of chunks is too aggressive at the moment though. Time differences < 1 ms aren't interesting and show up as 0 ms at the moment. Maybe start splitting after 50 ms? @spq

[peace-maker]

I've added a minimum threshold of delay to cause the chunk to be split of 50 ms. This makes the feature less obstrusive while hopefully adding value.

Before:

After:

It's better but there are weird negative offsets there caused by the timestamp for one direction staying the same while the one for the other direction advances. I haven't found what's causing this.

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