dart_code_metrics 4.4.0

• feat: introduce check-unused-l10n command.
• feat: add static code diagnostic prefer-const-border-radius. Thanks @konoshenko, @grafovdenis
• feat: improve static code diagnostic prefer-extracting-callbacks: don't trigger on empty function blocks and ignore Flutter builder functions. Thanks @roman-petrov @ookami-kb
• feat: improve unused files check, add support for vm:entry-point annotation.
• fix: compute Number of Parameters only for functions and methods.
• fix: Number of Parameters skip copyWith methods.
• fix: skip synthetic tokens while compute Source lines of Code.
• fix: update Maintainability Index metric comment message.