Reverse index of aliases by command instance.
This map allows:
Map of commands indexed by alias names.
Key is normalized alias (uppercase), value is the registered command object. Used for direct lookup by alias and conflict checks during registration.
Map of commands indexed by their global names
Map of commands indexed by their local names
The name of the command group
Interface representing a command group in the command stack. Groups commands by name and provides maps for both global and local command lookups.