read physical time metadata

[toloudis]

Feature Description

Put physical T units on same level as physical pixel dimensions.

Use Case

For time series data we need to be able to read the time interval between captures.

Solution

See https://github.com/bioio-devs/bioio-czi/issues/10 Also related to #25

[BrianWhitneyAI]

Getting started on this. @toloudis I am not sure how to go about this. is there some additional context I could ask for?