Enforcing typing in blocks.py and context.py

[abidlabs]

Fixing typing issues (#2832) and path-related refactoring (#2831) for the following files:

• blocks.py
• context.py

Adding typing has already discovered some bugs, such as a function that would raise False in place of return False!

Adds pyright to the CircleCI workflow to enforce typing in these two files. I used pyright because it was working more reliably than mypy for me in WSL and because it is already integrated into VSCode using the Pylance extension

Before (blocks.py):

After:

I had to touch other files in some cases to fix typing as it related to one of the two files above, but those other files are not fully correctly-typed yet. Also renamed queue.py to queuing.py and dataclasses.py to datacls.py because queue and dataclasses are built-in modules in Python, which was confusing the type checker

[github-actions]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-2887-all-demos

[freddyaboulton]

Awesome PR @abidlabs !! Will be very helpful as more contributors contribute to gradio as well.

I went through the deployed demos as well and everything looks good from the file refactor. If that's the case after merging in latest main, feel free to merge!

[abidlabs]

Thank you for the review @freddyaboulton!

[abidlabs]

All the demos look good to me!