TGA: RLE encoding #1078

Job	Run time
Fuzz targets (cargo-fuzz)	4m 9s
clippy	2m 26s
Fuzz targets (afl)	2m 26s
build_benchmarks	44s
public_private_dependencies	20s
rustfmt	13s
test_avif	1m 14s
test_avif_decoding	1m 19s
test_big_endian	58s
test_features	32s
test_big_endian (default)	2m 37s
test_toolchains (1.61.0)	2m 15s
cargo-deny	23s
test_features (default)	1m 10s
test_big_endian (webp)	1m 45s
test_toolchains (nightly)	1m 20s
test_features (gif)	34s
test_big_endian (webp-encoder)	2m 31s
test_toolchains (beta)	1m 18s
test_features (jpeg)	31s
verify_msrv	3m 59s
test_features (png)	33s
test_features (tiff)	32s
test_features (ico)	36s
test_features (pnm)	27s
test_features (tga)	26s
test_features (webp)	34s
test_features (bmp)	36s
test_features (hdr)	33s
test_features (dxt)	32s
test_features (dds)	26s
test_features (farbfeld)	26s
test_features (openexr)	48s
test_features (jpeg_rayon)	41s
test_features (webp-encoder)	58s
	40m 52s

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