New Rule S4545: "DebuggerDisplayAttribute" strings should reference existing members

[zsolt-kolbay-sonarsource]

Implement S4545 for C# and VB.NET

RSPEC PR: SonarSource/rspec#1571

Remark: implementation merged before corresponding RSPEC is ready. Changes to the sonar-dotnet repo are to be expected, when running rspec update upon release.

Peach Validation

During validation on peach, the following positive cases about case sensitivity were found:

• https://github.com/OData/odata.net/blob/2fad8d6c90b229272dc33d736a42d92dee8f6586/src/Microsoft.OData.Core/UriParser/ExpressionLexer.cs#L47
• https://github.com/OData/odata.net/blob/2fad8d6c90b229272dc33d736a42d92dee8f6586/src/Microsoft.OData.Core/UriParser/SearchLexer.cs#L25
• https://github.com/dotnet/wcf/blob/v3.2.1-rtm/src/dotnet-svcutil/lib/src/FrameworkFork/System.ServiceModel/System/ServiceModel/Description/OperationDescription.cs#L14

The check for existing members done by this implementation is done respecting case sensitivity rules for the language in which the source was written, although they should be done according to case sensitivity rules for the language in which the debugger is being executed.
Therefore, a DebuggerDisplayAttribute containing a format string with a reference to a property in wrong case would generate an exception in debugger when debugging a C# project, whereas it would not on a VB.NET project.