basic ECS spawner

addons/gecs/tests/systems/s_performance_test.gd

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+## Simple test system for performance benchmarking
+class_name PerformanceTestSystem
+extends System
+
+
+var process_count: int = 0
+
+
+func query():
+	return ECS.world.query.with_all([C_TestA])
+
+
+func process(entities: Array[Entity], components: Array, delta: float):
+	for entity in entities:
+		process_count += 1
+		# Simulate some light processing
+		var component = entity.get_component(C_TestA)
+		if component:
+			# Access component data (simulates typical system work)
+			var _value = component.value # Read property directly, not via reflection
+	
+	
+func reset_count():
+	process_count = 0