Add conditional compilation symbol typo analyzer

[jbevain]

Checklist

• I have read the Contribution Guide ;
• There is an approved issue describing the change when contributing a new analyzer or suppressor ;
• I have added tests that prove my fix is effective or that my feature works ;
• I have added necessary documentation (if appropriate) ;

Short description of what this resolves:

Avoid typos by suggesting when a compilation symbol is used that looks suspiciously like a compilation symbol defined in the csproj.