Add go-fuzz instrumentation for GPG parser and jsonapi

[dominikschulz]

No description provided.

[codecov]

Codecov Report

Merging #576 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #576   +/-   ##
=======================================
  Coverage   40.86%   40.86%           
=======================================
  Files         111      111           
  Lines        6544     6544           
=======================================
  Hits         2674     2674           
  Misses       3489     3489           
  Partials      381      381

Impacted Files	Coverage Δ
utils/jsonapi/api.go	0% <0%> (ø)	⬆️
backend/gpg/cli/parse_colons.go	0% <0%> (ø)	⬆️
backend/gpg/cli/gpg.go	0% <0%> (ø)	⬆️

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