Recognize ConditionalAttribute in BannedApiAnalyzers.

[manfred-brands]

Analyzer

RS0030: BannedApiAnalyzers

Describe the improvement

We don't want libraries to use the type Console, except in Debug or Verbose builds whilst debugging.
So we added a conditional reference to the Microsoft.CodeAnalysis.BannedApiAnalyzers with an appropriate BannedSymbols.txt

  <ItemGroup Condition="'$(Configuration)'=='Release'">
    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.4" />
    <AdditionalFiles Include="BannedSymbols.txt" />
  </ItemGroup>

However we have conditional executed code like:

[Conditional("VERBOSE")]
private static void Report(xxxx)
{
    System.Console.WriteLine(xxx);
}

I would like to be able to configure the analyzer to exclude reporting usages in methods annotated with the Conditional attribute using a specific constant.

Describe suggestions on how to achieve the rule

When usage of a banned api is detected, the analyzer should check for a ConditionalAttribute on the containing method/class and only report if the ConditionString doesn't match allowed conditions. Or better if the analyzer knows the predefined symbols doesn't match those.

Additional context