Add tiktoken as a dependency in pyproject.toml #3383

Job	Run time
check-proto-changes-python	1m 11s
codecov (./packages/autogen-core)	1m 3s
docs (./packages/autogen-core)	1m 32s
codecov (./packages/autogen-magentic-one)	2m 0s
codecov (./packages/autogen-ext)	2m 43s
docs-example-check (./packages/autogen-core)	2m 36s
codecov (./packages/autogen-agentchat)	1m 10s
format	2m 50s
lint	56s
markdown-code-lint	2m 17s
mypy (./packages/autogen-core)	2m 31s
mypy (./packages/autogen-magentic-one)	1m 33s
pyright (./packages/autogen-core)	58s
mypy (./packages/agbench)	57s
samples-code-check	1m 3s
pyright (./packages/autogen-magentic-one)	1m 22s
mypy (./packages/autogen-ext)	1m 52s
test (./packages/autogen-core)	56s
pyright (./packages/agbench)	2m 40s
mypy (./packages/autogen-agentchat)	1m 10s
test (./packages/autogen-magentic-one)	1m 34s
pyright (./packages/autogen-ext)	1m 2s
mypy (./packages/magentic-one-cli)	1m 10s
test (./packages/autogen-ext)	2m 51s
pyright (./packages/autogen-agentchat)	1m 0s
test (./packages/autogen-agentchat)	1m 14s
pyright (./packages/magentic-one-cli)	58s
	43m 9s

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