Make ImageEncoder::write_image assert that dimensions are valid #976

Job	Run time
test_features	1m 0s
test_features (default)	2m 2s
test_features (gif)	1m 4s
clippy	4m 5s
test_features (jpeg)	1m 1s
Fuzz targets (cargo-fuzz)	6m 53s
Fuzz targets (afl)	2m 34s
test_features (png)	1m 17s
test_features (tiff)	1m 17s
public_private_dependencies	25s
test_avif	1m 48s
test_features (ico)	1m 31s
test_avif_decoding	1m 42s
test_features (pnm)	1m 2s
test_features (tga)	1m 4s
test_big_endian	1m 39s
test_toolchains (1.61.0)	2m 59s
test_features (webp)	1m 5s
test_big_endian (default)	4m 7s
test_toolchains (nightly)	2m 48s
test_big_endian (webp)	1m 40s
test_features (bmp)	1m 7s
test_toolchains (beta)	2m 12s
test_big_endian (webp-encoder)	2m 50s
test_features (hdr)	1m 2s
test_features (dxt)	47s
test_features (dds)	1m 0s
cargo-deny	30s
build_benchmarks	1m 34s
test_features (farbfeld)	44s
test_features (openexr)	1m 31s
rustfmt	11s
verify_msrv	3m 13s
test_features (jpeg_rayon)	1m 12s
test_features (webp-encoder)	1m 39s
	1h 2m 35s

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