Added image_type optional argument to read_image

[pilotchute]

Contributing requested enhancement for:

• add image_type to read_image #442

An optional parameter image_type : str has been added, defaulting to None, for each supported image type, image_type is checked for None and for containing a case insensitive string matching the supported image type.

xradio/src/xradio/image/image.py

Lines 105 to 114 in 1221e20

	image_type : str, optional
	If None (default),
	the infile will attempt to be processed as a CASA, FITS, or zarr image.
	This is equivalent to image_type = 'casa fits zarr'.
	If image_type contains the string 'CASA' (case independant),
	the infile will only attempt to be processed as a CASA image.
	if image_type contains the string 'FITS' (case independant),
	the infile will only attempt to be processed as a FITS image.
	if image_type contains the string 'zarr' (case independant),
	the infile will only attempt to be processed as a zarr image.

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