feat(packaging)!: introduce slim agentex-client + heavy agentex-sdk split #1564

Job	Run time
find-tutorials	4s
test-10_async/00_base/000_hello_acp	1m 24s
test-00_sync/010_multiturn	1m 34s
test-10_async/10_temporal/010_agent_chat	1m 26s
test-00_sync/030_langgraph	1m 22s
test-10_async/00_base/040_other_sdks	1m 41s
test-10_async/00_base/080_batch_events	1m 28s
test-10_async/10_temporal/050_agent_chat_guardrails	2m 3s
test-10_async/00_base/010_multiturn	1m 46s
test-00_sync/040_pydantic_ai	1m 34s
test-10_async/00_base/020_streaming	1m 25s
test-00_sync/000_hello_acp	1m 22s
test-10_async/10_temporal/030_custom_activities	1m 22s
test-00_sync/020_streaming	1m 23s
test-10_async/00_base/030_tracing	1m 35s
test-10_async/00_base/100_langgraph	1m 32s
test-10_async/10_temporal/000_hello_acp	1m 24s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	1m 34s
test-10_async/00_base/110_pydantic_ai	1m 27s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	1m 23s
test-10_async/10_temporal/020_state_machine	1m 23s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	1m 24s
test-10_async/10_temporal/110_pydantic_ai	1m 33s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	1m 28s
Test Summary	3s
	34m 40s

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