Add mypy to core

[logan-markewich]

For a while, mypy has not been running properly.

Ideally we could run it with pants, but that is currently blocked.

So for now, we can at least run on core and keep that up-to-date.

This PR ends up fixing 800+ mypy issues.

Here are some notes:

• The datasets code had some weird typing issues, had to use ignore more than I wanted
• Anything needed a pydantic model as a function input/output is borked (had to use ignore)
• Sequence vs. List was very confusing to annotate. Fixed a few issues, but also used ignore for some
• SimpleDirectoryReader.aload_file was completely broken it seems like?
• The draw most recent workflow function also seemed (recently!) broken. I'll need to update the utils package

[nerdai]

For a while, mypy has not been running properly.

Ideally we could run it with pants, but that is currently blocked.

So for now, we can at least run on core and keep that up-to-date. There are many mypy issues (currently down to 699 at the time of writing)

ya pants would be nice. With a past monorepo, I resorted to using multiple mypy invocations with different entry points. But that was for like 2-3 different packages lol. We have over 400 here...

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[j3r0lin]

Why is there a need to check the type of chat_response again, when the earlier logic already allows dummy stream chat responses, making this seem redundant or conflicting?

[logan-markewich]

mypy was complaining that it wasn't the correct type

I see the issue though since it could technically return AgentChatResponse

Will need a pr to clean up that logic