Add more proj fields to gdal item creation #592

Job	Run time
macos	1m 1s
ubuntu-with-gdal (-p stac -p stac-cli -F gdal)	1m 13s
doc	1m 7s
ubuntu-with-gdal (--all-features)	3m 9s
fmt	6s
ubuntu (-p stac)	31s
ubuntu (-p stac -F reqwest)	1m 31s
ubuntu (-p stac-api)	12s
ubuntu (-p stac -p stac-api -F geo)	42s
ubuntu (-p stac -p stac-api -F schemars)	32s
ubuntu (-p stac-async)	46s
windows	3m 33s
ubuntu (-p stac-cli)	49s
ubuntu (-p stac-validate)	1m 1s
	16m 13s

Provide feedback