TGA: RLE encoding #1079

Job	Run time
test_big_endian	1m 10s
test_big_endian (default)	2m 32s
Fuzz targets (cargo-fuzz)	4m 14s
test_big_endian (webp)	1m 25s
build_benchmarks	46s
Fuzz targets (afl)	2m 28s
test_big_endian (webp-encoder)	2m 23s
clippy	2m 6s
public_private_dependencies	17s
rustfmt	13s
test_avif	1m 13s
test_avif_decoding	1m 16s
test_features	31s
test_toolchains (1.61.0)	2m 11s
test_features (default)	1m 15s
test_toolchains (nightly)	1m 8s
cargo-deny	20s
test_features (gif)	29s
test_toolchains (beta)	1m 12s
test_features (jpeg)	29s
test_features (png)	34s
verify_msrv	4m 1s
test_features (tiff)	38s
test_features (ico)	36s
test_features (pnm)	34s
test_features (tga)	31s
test_features (webp)	29s
test_features (bmp)	30s
test_features (hdr)	28s
test_features (dxt)	26s
test_features (dds)	32s
test_features (farbfeld)	27s
test_features (openexr)	42s
test_features (jpeg_rayon)	35s
test_features (webp-encoder)	56s
	39m 37s

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