feat: add batch updates support

[javierdfm]

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https://linear.app/stream/issue/CHA-1615/python

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• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

mypy

---

🚫 [mypy] _{reported by reviewdog 🐶}
Name "ChannelBatchUpdater" is not defined [name-defined]

stream-chat-python/stream_chat/async_chat/client.py

Line 1049 in 4f19a12

def channel_batch_updater(self) -> "ChannelBatchUpdater":

---

🚫 [mypy] _{reported by reviewdog 🐶}
Call to untyped function "ChannelBatchUpdater" in typed context [no-untyped-call]

stream-chat-python/stream_chat/async_chat/client.py

Line 1057 in 4f19a12

return ChannelBatchUpdater(self)