refactor: Move events module to crewai.events (#3425)

refactor(events): relocate events module & update imports

- Move events from utilities/ to top-level events/ with types/, listeners/, utils/ structure
- Update all source/tests/docs to new import paths
- Add backwards compatibility stubs in crewai.utilities.events with deprecation warnings
- Restore test mocks and fix related test imports

docs/ko/concepts/event-listener.mdx

@@ -44,12 +44,12 @@ Prompt Tracing을 통해 다음과 같은 작업이 가능합니다:
 아래는 커스텀 이벤트 리스너 클래스의 간단한 예시입니다:
 
 ```python
-from crewai.utilities.events import (
+from crewai.events import (
     CrewKickoffStartedEvent,
     CrewKickoffCompletedEvent,
     AgentExecutionCompletedEvent,
 )
-from crewai.utilities.events.base_event_listener import BaseEventListener
+from crewai.events import BaseEventListener
 
 class MyCustomListener(BaseEventListener):
     def __init__(self):
@@ -146,7 +146,7 @@ my_project/
 
 ```python
 # my_custom_listener.py
-from crewai.utilities.events.base_event_listener import BaseEventListener
+from crewai.events import BaseEventListener
 # ... import events ...
 
 class MyCustomListener(BaseEventListener):
@@ -279,7 +279,7 @@ CrewAI는 여러분이 청취할 수 있는 다양한 이벤트를 제공합니
 임시 이벤트 처리가 필요한 경우(테스트 또는 특정 작업에 유용함), `scoped_handlers` 컨텍스트 관리자를 사용할 수 있습니다:
 
 ```python
-from crewai.utilities.events import crewai_event_bus, CrewKickoffStartedEvent
+from crewai.events import crewai_event_bus, CrewKickoffStartedEvent
 
 with crewai_event_bus.scoped_handlers():
     @crewai_event_bus.on(CrewKickoffStartedEvent)

docs/ko/concepts/knowledge.mdx

@@ -683,11 +683,11 @@ CrewAI는 knowledge 검색 과정에서 이벤트를 발생시키며, 이벤트
 #### 예시: Knowledge Retrieval 모니터링
 
 ```python
-from crewai.utilities.events import (
+from crewai.events import (
     KnowledgeRetrievalStartedEvent,
     KnowledgeRetrievalCompletedEvent,
+    BaseEventListener,
 )
-from crewai.utilities.events.base_event_listener import BaseEventListener
 
 class KnowledgeMonitorListener(BaseEventListener):
     def setup_listeners(self, crewai_event_bus):

docs/ko/concepts/llms.mdx

@@ -731,10 +731,10 @@ CrewAI는 LLM의 스트리밍 응답을 지원하여, 애플리케이션이 출
     CrewAI는 스트리밍 중 수신되는 각 청크에 대해 이벤트를 발생시킵니다:
 
     ```python
-    from crewai.utilities.events import (
+    from crewai.events import (
       LLMStreamChunkEvent
     )
-    from crewai.utilities.events.base_event_listener import BaseEventListener
+    from crewai.events import BaseEventListener
 
     class MyCustomListener(BaseEventListener):
         def setup_listeners(self, crewai_event_bus):
@@ -756,8 +756,8 @@ CrewAI는 LLM의 스트리밍 응답을 지원하여, 애플리케이션이 출
 
     ```python
     from crewai import LLM, Agent, Task, Crew
-    from crewai.utilities.events import LLMStreamChunkEvent
-    from crewai.utilities.events.base_event_listener import BaseEventListener
+    from crewai.events import LLMStreamChunkEvent
+    from crewai.events import BaseEventListener
 
     class MyCustomListener(BaseEventListener):
         def setup_listeners(self, crewai_event_bus):

docs/ko/concepts/memory.mdx

@@ -985,8 +985,8 @@ CrewAI는 다음과 같은 메모리 관련 이벤트를 발생시킵니다:
 애플리케이션을 최적화하기 위해 메모리 작업 타이밍을 추적하세요:
 
 ```python
-from crewai.utilities.events.base_event_listener import BaseEventListener
-from crewai.utilities.events import (
+from crewai.events import (
+    BaseEventListener,
     MemoryQueryCompletedEvent,
     MemorySaveCompletedEvent
 )
@@ -1020,8 +1020,8 @@ memory_monitor = MemoryPerformanceMonitor()
 디버깅 및 인사이트를 위해 메모리 작업을 로깅합니다:
 
 ```python
-from crewai.utilities.events.base_event_listener import BaseEventListener
-from crewai.utilities.events import (
+from crewai.events import (
+    BaseEventListener,
     MemorySaveStartedEvent,
     MemoryQueryStartedEvent,
     MemoryRetrievalCompletedEvent
@@ -1061,8 +1061,8 @@ memory_logger = MemoryLogger()
 메모리 오류를 캡처하고 대응합니다:
 
 ```python
-from crewai.utilities.events.base_event_listener import BaseEventListener
-from crewai.utilities.events import (
+from crewai.events import (
+    BaseEventListener,
     MemorySaveFailedEvent,
     MemoryQueryFailedEvent
 )
@@ -1111,8 +1111,8 @@ error_tracker = MemoryErrorTracker(notify_email="admin@example.com")
 메모리 이벤트는 분석 및 모니터링 플랫폼으로 전달되어 성능 지표를 추적하고, 이상 징후를 감지하며, 메모리 사용 패턴을 시각화할 수 있습니다:
 
 ```python
-from crewai.utilities.events.base_event_listener import BaseEventListener
-from crewai.utilities.events import (
+from crewai.events import (
+    BaseEventListener,
     MemoryQueryCompletedEvent,
     MemorySaveCompletedEvent
 )