Update existing workflow and precommit hooks to also check the examples mypy type error

[badmonster0]

Update existing workflow and precommit hooks to also check the examples mypy type error

https://github.com/cocoindex-io/cocoindex/blob/main/.github/workflows/_test.yml

precommit hook
https://github.com/cocoindex-io/cocoindex/blob/main/.pre-commit-config.yaml

[TechyKunj]

I'd love to work on this issue for Hacktoberfest. Can I take it up?

[harshyadav028]

I'd like to work on this issue.