types: add fuzzers

[AdamKorcz]

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

Summary

Adds fuzzers for the following types:

• helm
• intoto
• rekord
• rfc3161
• rpm
• tuf

The purpose of this PR is to get coverage of the types with initial simple fuzzers.

Each fuzzer targets the CreateProposedEntry and UnmarshalEntry method of the type.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #1225 (9d7b28a) into main (d0f9242) will decrease coverage by 22.21%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #1225       +/-   ##
===========================================
- Coverage   64.26%   42.04%   -22.22%     
===========================================
  Files          82       74        -8     
  Lines        7628     7209      -419     
===========================================
- Hits         4902     3031     -1871     
- Misses       2098     3870     +1772     
+ Partials      628      308      -320     

Flag	Coverage Δ
e2etests	?
unittests	42.04% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/api/metrics.go	0.00% <0.00%> (-100.00%)	⬇️
cmd/rekor-cli/app/useragent.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/api/trillian_client.go	0.00% <0.00%> (-66.31%)	⬇️
pkg/api/api.go	0.00% <0.00%> (-64.29%)	⬇️
pkg/api/entries.go	0.00% <0.00%> (-64.00%)	⬇️
pkg/types/types.go	0.00% <0.00%> (-63.64%)	⬇️
pkg/types/versionmap.go	0.00% <0.00%> (-63.42%)	⬇️
pkg/api/error.go	0.00% <0.00%> (-59.78%)	⬇️
cmd/rekor-cli/app/verify.go	2.47% <0.00%> (-53.72%)	⬇️
cmd/rekor-cli/app/log_info.go	2.50% <0.00%> (-52.50%)	⬇️
... and 45 more

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