Determine custom output WCS bounding box from input images

[stscijgbot-jp]

Issue JP-3874 was created on JIRA by Mihai Cara:

When custom output WCS for resample is missing both array_shape and the bounding box, we should be able to determine them from input images by projecting them onto the output WCS and take max(x) and max(y) of projected coordinates.

 

See https://github.com/spacetelescope/stcal/blob/3ce9cedc1d0825f8ba86316a0706fa03f929a3ed/src/stcal/resample/resample.py#L533-L541 and spacetelescope/stcal#320 (comment)