add pixel_shape to WCS converter #617

Job	Run time
retrieve current CRDS context	2s
test / Load tox environments	6s
check / Load tox environments	7s
test_downstream / Load tox environments	7s
test / test (ubuntu-latest)	1m 1s
test / test-numpy125 (ubuntu-latest)	59s
test / test-numpy122 (ubuntu-latest)	51s
test / test (ubuntu-latest)	52s
test / test-numpy125 (ubuntu-latest)	56s
test / test-numpy122 (ubuntu-latest)	53s
test / test (ubuntu-latest)	59s
test / test (macos-latest)	1m 18s
test / test-dev (ubuntu-latest)	1m 53s
test / test-pyargs (ubuntu-latest)	51s
test / test-cov (ubuntu-latest)	59s
check / check-style (ubuntu-latest)	14s
check / check-security (ubuntu-latest)	16s
test_downstream / py310-test-jwst-cov-xdist (ubuntu-latest)	14m 10s
	26m 34s

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