fuzzing: move alpine utils to fuzz utils

[AdamKorcz]

Signed-off-by: AdamKorcz adam@adalogics.com

Summary

1. Moves the alpine fuzz utils to pkg/fuzz.
2. Creates a CreateAlpineProps that the pkg/types/alpine/v0.0.1 fuzzer now uses to create the props with structured bytes.
3. Adds AlpineArtifactBytes which generate the structured artifact bytes. This is mainly the logic that was done inside the pkg/types/alpine fuzzer, which instead has been modified to get the artifact bytes from AlpineArtifactBytes.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #1335 (00f1223) into main (b5912d2) will increase coverage by 21.28%.
The diff coverage is n/a.

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@@             Coverage Diff             @@
##             main    #1335       +/-   ##
===========================================
+ Coverage   42.80%   64.08%   +21.28%     
===========================================
  Files          74       82        +8     
  Lines        7441     7889      +448     
===========================================
+ Hits         3185     5056     +1871     
+ Misses       3921     2180     -1741     
- Partials      335      653      +318     

Flag	Coverage Δ
e2etests	47.69% <ø> (?)
unittests	42.78% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/rekor-server/app/version.go	100.00% <0.00%> (ø)
pkg/storage/storage.go	45.71% <0.00%> (ø)
cmd/rekor-cli/app/state/state.go	61.81% <0.00%> (ø)
cmd/rekor-server/app/serve.go	84.61% <0.00%> (ø)
cmd/rekor-server/app/watch.go	2.91% <0.00%> (ø)
cmd/rekor-cli/app/format/wrap.go	59.09% <0.00%> (ø)
pkg/log/log.go	47.61% <0.00%> (ø)
cmd/rekor-server/app/root.go	56.66% <0.00%> (ø)
pkg/pki/pgp/pgp.go	78.60% <0.00%> (+0.93%)	⬆️
pkg/pki/minisign/minisign.go	75.83% <0.00%> (+1.66%)	⬆️
... and 45 more

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