test: add test to check if compiler output strings is valid utf8

[legendiguess]

closes #52

[codecov]

Codecov Report

Merging #67 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   72.09%   72.14%   +0.04%     
==========================================
  Files         109      109              
  Lines        7279     7291      +12     
==========================================
+ Hits         5248     5260      +12     
  Misses       2031     2031

Impacted Files	Coverage Δ
crates/mun_runtime/src/test.rs	96.35% <100%> (+0.35%)	⬆️
crates/mun_target/src/spec/windows_msvc_base.rs	100% <0%> (ø)	⬆️
...ates/mun_target/src/spec/x86_64_pc_windows_msvc.rs	100% <0%> (ø)	⬆️
crates/mun_codegen/src/code_gen/linker.rs	35.63% <0%> (ø)	⬆️

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[Wodann]

Nice job on the pull request. This is precisely the set-up that we were looking for :)

[Wodann]

Nice. Now the unit test is much more minimalistic :)

There is still one typo left. Can you fix that? Once that's done, I'll merge both of your pull requests 👍

[baszalmstra]

Create tests that validate assumptions about interop between compiler and runtime