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Move image compression-related function to a separate package.
In preperation for subsequent changes that make decompression
more complex. Prog package is already large and complex.
Also makes running compression tests/benchmarks much faster.
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Currently we uncompress all images in Deserialize to check that the data is valid.
As the result deserializing all seeds we have takes ~40 seconds of real time
and ~125 seconds of CPU time. And we do this during every syz-manager start.
Don't materialize the uncompressed image.
This reduces real time to ~15 seconds and CPU time to 18 seconds (no garbage collections).
In syz-manager the benefit is even larger since garbage collections take longer (larger heap).
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Add the file `compression.go`, with entry points for
compressing/decompressing using `zlib`, and encoding/decoding Base64.
Also add roundtrip compress/decompress and encode/decode tests.
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