Allow mocked types to reference unsafe package or unknown types

[myshkin5]

Fixes #117

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 92.07%. Comparing base (187ce68) to head (942417b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   92.14%   92.07%   -0.08%     
==========================================
  Files          17       17              
  Lines        3222     3230       +8     
==========================================
+ Hits         2969     2974       +5     
- Misses        196      198       +2     
- Partials       57       58       +1     

Files	Coverage Δ
generator/testmoqs/types.go	0.00% <ø> (ø)
generator/converter.go	95.27% <62.50%> (-0.17%)	⬇️