Make ImageEncoder::write_image assert that dimensions are valid #974

Job	Run time
test_avif	1m 45s
test_big_endian	1m 22s
test_toolchains (1.61.0)	3m 38s
test_big_endian (default)	3m 29s
test_features	53s
test_toolchains (nightly)	2m 4s
build_benchmarks	1m 8s
test_big_endian (webp)	2m 12s
test_features (default)	2m 11s
test_toolchains (beta)	2m 12s
test_features (gif)	1m 15s
test_big_endian (webp-encoder)	2m 52s
test_features (jpeg)	1m 25s
Fuzz targets (afl)	1m 50s
test_features (png)	58s
Fuzz targets (cargo-fuzz)	8m 11s
cargo-deny	31s
test_features (tiff)	1m 6s
clippy	4m 41s
test_features (ico)	1m 31s
public_private_dependencies	29s
test_features (pnm)	1m 11s
rustfmt	13s
test_features (tga)	54s
test_avif_decoding	1m 48s
verify_msrv	3m 12s
test_features (webp)	53s
test_features (bmp)	52s
test_features (hdr)	46s
test_features (dxt)	1m 11s
test_features (dds)	52s
test_features (farbfeld)	52s
test_features (openexr)	1m 17s
test_features (jpeg_rayon)	1m 3s
test_features (webp-encoder)	1m 33s
	1h 2m 20s

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