Clear / No Color renders for X-Range

[Alexander-Da-Great]

Checked for duplicates

Yes - I've already checked

Alternatives considered

No - I haven't considered

Related problems

No response

Describe the feature request

There are some situations where we would like to render no color and no text in the timeline for X-Range profiles. I think that the blank string could be a valid option to explicitly call out this behavior. Another option would be to allow for hexcode strings maybe enforced to be wrapped in parenthesis which the createTimelineXRangeLayer in the aerie UI processes and applies to that particular segment of an X-Range.

One format that would make sense would be if the UI sees the string (#hexcode)[text] it fills that range of the X-range with the color found in the hexcode and the text found in the text