Refactor target name handling and normalization

- Simplified target variable construction in
  `LibraryDefinitionCSharpCodeGenerator.cs` by using
  `targetName` directly.

- Updated `ClassName` property in
  `LibrarySetCSharpCodeGenerator.cs` to normalize
  `VersionedLibraryIdentifier` without underscores.

- Improved library dependency normalization by removing
  underscore formatting before normalization.

Author: baseTwo

Cql/CodeGeneration.NET/LibraryDefinitionCSharpCodeGenerator.cs

@@ -115,7 +115,7 @@ private string GetTargetedMemberName(
         {
             var target = targetName == LibraryName
                              ? "this"
-                             : $"{IdentifierNormalizer.Normalize(CqlVersionedLibraryIdentifier.Parse(targetName).FormatDelimited('_'))}.Instance";
+                             : $"{IdentifierNormalizer.Normalize(targetName)}.Instance";
             var member = IdentifierNormalizer.Normalize(memberName);
             return $"{target}.{member}";
         }

Cql/CodeGeneration.NET/LibrarySetCSharpCodeGenerator.cs

@@ -144,7 +144,7 @@ public LibraryWriter(
 
         private CqlVersionedLibraryIdentifier LibraryVersionedIdentifier => Library.VersionedLibraryIdentifier!;
         public string LibraryName { get; } = Library.VersionedLibraryIdentifier;
-        private string ClassName { get; } = IdentifierNormalizer.Normalize(Library.VersionedLibraryIdentifier.FormatDelimited('_'));
+        private string ClassName { get; } = IdentifierNormalizer.Normalize(Library.VersionedLibraryIdentifier);
 
         public LibraryWriter AddIndent(int addIndent = 1)
         {
@@ -206,7 +206,7 @@ private void WriteLibraryInterfaceImplementation()
             var dependencies =
                 LibrarySetWriter.LibrarySet
                                 .GetLibraryDependencies(LibraryName, throwError: true)
-                                .Select(dep => IdentifierNormalizer.Normalize(dep.VersionedLibraryIdentifier.FormatDelimited('_')))
+                                .Select(dep => IdentifierNormalizer.Normalize(dep.VersionedLibraryIdentifier))
                                 .Select(typeName => $"{typeName}.Instance");
             IndentedTextWriter.WriteLine($"""
                                           public ILibrary[] Dependencies => [{string.Join(", ", dependencies)}];