add a fuzzer that compresses the gzip header

[folkertdev]

this found the bugs in #381.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
zlib-rs/src/lib.rs	0.00%	1 Missing ⚠️

Flag	Coverage Δ
fuzz-compress	40.86% <0.00%> (-0.01%)	⬇️
fuzz-decompress	30.63% <0.00%> (-0.22%)	⬇️
test-aarch64-apple-darwin	92.19% <ø> (-1.10%)	⬇️
test-x86_64-apple-darwin	91.51% <ø> (-0.22%)	⬇️
test-x86_64-unknown-linux-gnu	90.26% <ø> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
zlib-rs/src/lib.rs	92.59% <0.00%> (-1.75%)	⬇️

... and 2 files with indirect coverage changes

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