Fix all pre-commit errors

[arnaudgelas]

When running pre-commit run --all-files

src/crewai/init.py:1:26: F401 crewai.agent.Agent imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/init.py:2:25: F401 crewai.crew.Crew imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/init.py:3:28: F401 crewai.process.Process imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/init.py:4:25: F401 crewai.task.Task imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/agents/init.py:1:34: F401 .cache.cache_handler.CacheHandler imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/agents/init.py:2:23: F401 .executor.CrewAgentExecutor imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/agents/init.py:3:21: F401 .parser.CrewAgentParser imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/agents/init.py:4:28: F401 .tools_handler.ToolsHandler imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/agents/cache/init.py:1:28: F401 .cache_handler.CacheHandler imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/memory/init.py:1:35: F401 .entity.entity_memory.EntityMemory imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/memory/init.py:2:41: F401 .long_term.long_term_memory.LongTermMemory imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/memory/init.py:3:43: F401 .short_term.short_term_memory.ShortTermMemory imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/project/init.py:1:26: F401 .annotations.agent imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/project/init.py:1:33: F401 .annotations.crew imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/project/init.py:1:39: F401 .annotations.task imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/project/init.py:2:24: F401 .crew_base.CrewBase imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/telemetry/init.py:1:24: F401 .telemetry.Telemetry imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:1:24: F401 .converter.Converter imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:1:35: F401 .converter.ConverterError imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:2:19: F401 .i18n.I18N imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:3:25: F401 .instructor.Instructor imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:4:21: F401 .logger.Logger imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:5:22: F401 .printer.Printer imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:6:22: F401 .prompts.Prompts imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:7:29: F401 .rpm_controller.RPMController imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:8:26: F401 .fileHandler.FileHandler imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/init.py:9:21: F401 .parser.YamlParser imported but unused; consider removing, adding to __all__, or using a redundant alias src/crewai/utilities/logger.py:16:25: F821 Undefined name datetime