fetchEntityName abstract method
Fetch an entity name from the data source
Subclasses must implement this to perform the actual lookup (e.g., API call, database query, etc.)
entityType - The type of entity to resolve
id - The entity's unique identifier
context - Optional context map with additional information
Returns the entity's display name, or null if not found/supported
Implementation
Future<String?> fetchEntityName(
String entityType,
String id, {
Map<String, String>? context,
});