Make ImageEncoder::write_image assert that dimensions are valid #972

Job	Run time
Fuzz targets (afl)	2m 0s
build_benchmarks	1m 21s
cargo-deny	29s
Fuzz targets (cargo-fuzz)	6m 55s
clippy	3m 0s
public_private_dependencies	26s
rustfmt	5s
test_avif	1m 47s
test_avif_decoding	2m 3s
test_big_endian	1m 31s
test_big_endian (default)	3m 27s
test_toolchains (1.61.0)	3m 1s
test_features	1m 13s
test_toolchains (nightly)	2m 6s
test_big_endian (webp)	1m 46s
verify_msrv	3m 11s
test_toolchains (beta)	2m 40s
test_features (default)	2m 9s
test_big_endian (webp-encoder)	2m 42s
test_features (gif)	50s
test_features (jpeg)	3m 20s
test_features (png)	1m 12s
test_features (tiff)	1m 16s
test_features (ico)	1m 21s
test_features (pnm)	55s
test_features (tga)	46s
test_features (webp)	51s
test_features (bmp)	55s
test_features (hdr)	57s
test_features (dxt)	48s
test_features (dds)	59s
test_features (farbfeld)	43s
test_features (openexr)	1m 16s
test_features (jpeg_rayon)	1m 6s
test_features (webp-encoder)	1m 34s
	1h 0m 41s

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