basic ECS spawner

addons/gecs/tests/systems/o_performance_test.gd

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+## Simple observer for performance benchmarking
+class_name O_PerformanceTest
+extends Observer
+
+var added_count: int = 0
+var removed_count: int = 0
+var changed_count: int = 0
+
+func watch() -> Resource:
+	return C_ObserverTest
+
+func match() -> QueryBuilder:
+	return q.with_all([C_ObserverTest])
+
+func on_component_added(entity: Entity, component: Resource) -> void:
+	added_count += 1
+
+func on_component_removed(entity: Entity, component: Resource) -> void:
+	removed_count += 1
+
+func on_component_changed(
+	entity: Entity, component: Resource, property: String, old_value: Variant, new_value: Variant
+) -> void:
+	changed_count += 1
+	# Simulate some processing
+	var _val = component.get("value")
+
+func reset_counts():
+	added_count = 0
+	removed_count = 0
+	changed_count = 0