G115 Struct Attribute Checks

[czechbol]

Similarly to the arithmetic example in #1212, the value being checked is, according to the SSA, different from the value being converted. So we have to be a bit smarter. Not as smart as with the arithmetic though.

I also found that explicit checks are still lacking, I partly fixed them and I'll document the rest in the issue.

[czechbol]

Thanks @Victoremepunto for reporting this issue twice, I didn't see it the first time.
I've tested this PR against your codebase and it's not reporting G115 anymore.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 87.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 68.66%. Comparing base (5f3194b) to head (e64423b).

Files with missing lines	Patch %	Lines
analyzers/conversion_overflow.go	87.50%	3 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1221      +/-   ##
==========================================
+ Coverage   68.48%   68.66%   +0.17%     
==========================================
  Files          75       75              
  Lines        4360     4381      +21     
==========================================
+ Hits         2986     3008      +22     
- Misses       1226     1227       +1     
+ Partials      148      146       -2     

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[Victoremepunto]

Thanks @Victoremepunto for reporting this issue twice, I didn't see it the first time. I've tested this PR against your codebase and it's not reporting G115 anymore.

Saw that. Thanks, I appreciate the help, looking forward to the release!