Improve panic messages when providing invalid buffer sizes to `ImageEncoder`s #1178

Job	Run time
cargo-deny	20s
Fuzz targets (afl)	1m 36s
build_benchmarks	48s
Fuzz targets (cargo-fuzz)	5m 35s
clippy	2m 12s
public_private_dependencies	17s
rustfmt	5s
test_avif	1m 1s
test_avif_decoding	1m 52s
test_other_archs (powerpc-unknown-linux-gnu, default)	3m 35s
test_features	37s
test_other_archs (powerpc-unknown-linux-gnu, webp-encoder)	2m 0s
test_features (default)	1m 26s
test_toolchains (1.61.0)	26s
verify_msrv	2m 49s
test_features (gif)	33s
test_toolchains (nightly)	1m 30s
test_features (jpeg)	24s
test_other_archs (i686-unknown-linux-gnu, default)	1m 38s
test_toolchains (beta)	1m 37s
test_features (png)	40s
test_other_archs (i686-unknown-linux-gnu, webp-encoder)	1m 8s
test_features (tiff)	32s
test_features (ico)	31s
test_features (pnm)	36s
test_features (tga)	28s
test_features (webp)	35s
test_features (bmp)	25s
test_features (hdr)	20s
test_features (dxt)	32s
test_features (dds)	20s
test_features (farbfeld)	21s
test_features (openexr)	48s
test_features (jpeg_rayon)	28s
test_features (webp-encoder)	1m 19s
	39m 24s

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