Match Ycbcr TIFF decoding to rasterio/libtiff

[kylebarron]

Currently we have two python tests that don't have exactly the same decoded values as rasterio/libtiff.

async-tiff/python/tests/test_integration_rasterio.py

Lines 44 to 48 in 402c0a5

	# Ycbcr subsampling not implemented
	# ("rio-tiler", "cog_rgb_with_stats"),
	("umbra", "sydney_airport_GEC"),
	# Ycbcr subsampling not implemented
	# ("vantor", "maxar_opendata_yellowstone_visual"),

E       AssertionError:
E       Arrays are not equal
E
E       Mismatched elements: 7858 / 49152 (16%)
E       Max absolute difference among violations: 4
E       Max relative difference among violations: 0.33333333
E        ACTUAL: array([[[141, 146, 139],
E               [141, 146, 139],
E               [160, 163, 154],...
E        DESIRED: array([[[141, 146, 139],
E               [141, 146, 139],
E               [160, 163, 154],...

E       AssertionError:
E       Arrays are not equal
E
E       Mismatched elements: 212 / 12288 (1.73%)
E       Max absolute difference among violations: 3
E       Max relative difference among violations: 0.0483871
E        ACTUAL: array([[[54, 75, 56],
E               [59, 80, 61],
E               [64, 85, 66],...
E        DESIRED: array([[[54, 75, 56],
E               [59, 80, 61],
E               [64, 85, 66],...