Use official cloud event proto schema (#4487) #8

Job	Run time
check-proto-changes-python	1m 14s
docs (./packages/autogen-core)	1m 26s
format	50s
docs-example-check (./packages/autogen-core)	2m 9s
lint	51s
mypy (./packages/autogen-core)	2m 4s
pyright (./packages/autogen-core)	57s
mypy (./packages/autogen-magentic-one)	1m 14s
pyright (./packages/autogen-magentic-one)	1m 13s
mypy (./packages/agbench)	56s
pyright (./packages/agbench)	1m 3s
test (./packages/autogen-core)	57s
pyright (./packages/autogen-ext)	1m 3s
mypy (./packages/autogen-ext)	1m 41s
test (./packages/autogen-magentic-one)	1m 26s
mypy (./packages/autogen-agentchat)	1m 10s
pyright (./packages/autogen-agentchat)	56s
test (./packages/autogen-ext)	2m 29s
test (./packages/autogen-agentchat)	1m 11s
	24m 50s

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