feat: adding workflow to check if each folder in packages/ contains __tests__ directory and README.md to maintain folder structure

[ai16z-demirix]

Relates to

#1649

Risks

Low: Adding new workflow check to check folder structure in packages directory.

Background

What does this PR do?

This PR includes workflow check: checking if every directory in packages folder containes tests and README.md

What kind of change is this?

feat

#1649

Documentation changes needed?

None

Testing

Where should a reviewer start?

github actions folder and scripts folder

Detailed testing steps

[monilpat]

Amazing thanks so much for doing this! Great work! Note this is gonna cause every PR after this one to fail this check. We shouldn't make it required until we update the existing folders under packages to have a tests folder and a readme

[shakkernerd]

I have approved but will make this a draft until all packages are properly structured.