TGA: RLE encoding #1062

Job	Run time
build_benchmarks	44s
Fuzz targets (afl)	2m 18s
cargo-deny	21s
Fuzz targets (cargo-fuzz)	4m 5s
clippy	2m 14s
public_private_dependencies	18s
rustfmt	14s
test_avif	1m 18s
test_avif_decoding	1m 17s
test_big_endian	53s
test_big_endian (default)	2m 17s
test_toolchains (1.61.0)	1m 49s
test_features	42s
test_toolchains (nightly)	2m 10s
verify_msrv	3m 54s
test_features (default)	1m 26s
test_toolchains (beta)	1m 25s
test_big_endian (webp)	1m 16s
test_features (gif)	45s
test_big_endian (webp-encoder)	2m 33s
test_features (jpeg)	47s
test_features (png)	30s
test_features (tiff)	32s
test_features (ico)	58s
test_features (pnm)	28s
test_features (tga)	24s
test_features (webp)	24s
test_features (bmp)	45s
test_features (hdr)	49s
test_features (dxt)	45s
test_features (dds)	46s
test_features (farbfeld)	43s
test_features (openexr)	39s
test_features (jpeg_rayon)	42s
test_features (webp-encoder)	49s
	42m 0s

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