test: add fuzz test

[AdamKorcz]

Adds a fuzz test from cncf-fuzzing: https://github.com/cncf/cncf-fuzzing/blob/main/projects/notary/fuzz_pkix_test.go

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.34%. Comparing base (84c2ec0) to head (da93344).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #459   +/-   ##
=======================================
  Coverage   81.34%   81.34%           
=======================================
  Files          34       34           
  Lines        2578     2578           
=======================================
  Hits         2097     2097           
  Misses        335      335           
  Partials      146      146           

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[yizha1]

@AdamKorcz You may need to merge the latest changes and sign-off the commit again.

[AdamKorcz]

@AdamKorcz You may need to merge the latest changes and sign-off the commit again.

done

[ghost]

Hi @AdamKorcz, same to the notation-core-go PR, you will need to use the -S flag in your git command to sign the commit (needs to be capital S). The -s or --signoff flags only signoff the commit but not signing it.

[AdamKorcz]

Have signed the commit.

[ghost]

LGTM

[shizhMSFT]

LGTM

[priteshbandi]

LGTM