Analyze floating-point method signatures

[Jim8y]

Summary

• report float, double, and decimal usage in method return types
• report float, double, and decimal usage in method parameters
• add analyzer tests for floating-point method signatures

Validation

• dotnet test tests/Neo.SmartContract.Analyzer.UnitTests/Neo.SmartContract.Analyzer.UnitTests.csproj --filter "MethodSignature_ShouldReportDiagnostic" --no-restore
• dotnet test tests/Neo.SmartContract.Analyzer.UnitTests/Neo.SmartContract.Analyzer.UnitTests.csproj --no-restore

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.24%. Comparing base (512f278) to head (4085ad4).

Additional details and impacted files

@@              Coverage Diff              @@
##           master-n3    #1587      +/-   ##
=============================================
- Coverage      80.25%   80.24%   -0.01%     
=============================================
  Files            295      295              
  Lines          25456    25456              
  Branches        3453     3453              
=============================================
- Hits           20429    20428       -1     
  Misses          4132     4132              
- Partials         895      896       +1     

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