Deprecate incremental decoding #952

Job	Run time
test_toolchains (1.61.0)	43s
test_toolchains (nightly)	2m 53s
test_toolchains (beta)	2m 9s
test_features	43s
test_features (default)	2m 5s
test_features (gif)	43s
test_features (jpeg)	39s
test_features (png)	42s
test_features (tiff)	1m 5s
test_features (ico)	55s
test_features (pnm)	39s
test_features (tga)	33s
test_features (webp)	53s
test_features (bmp)	35s
test_features (hdr)	41s
test_features (dxt)	41s
test_features (dds)	41s
test_features (farbfeld)	53s
test_features (openexr)	1m 13s
test_features (jpeg_rayon)	1m 0s
test_features (webp-encoder)	1m 12s
Fuzz targets (afl)	2m 29s
Fuzz targets (cargo-fuzz)	7m 21s
clippy	3m 24s
test_avif	1m 54s
test_avif_decoding	2m 14s
test_big_endian	1m 32s
test_big_endian (default)	4m 26s
test_big_endian (webp)	1m 43s
test_big_endian (webp-encoder)	3m 55s
build_benchmarks	1m 9s
cargo-deny	31s
public_private_dependencies	27s
rustfmt	19s
verify_msrv	2m 48s
	55m 50s

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