Create action to check package.json

Create a Github Action that parses package.json and ensures that it follows our conventions:

- check that the version of the `dependencies` values is always a fixed semver (regex is `^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$` from the [semver spec](https://semver.org/)). In particular, `github:...` and ranged semvers should not be allowed.
- check that name is name of repo
- check license
- check that `resolutions` is minimal, and that the versions are expected

It shoud prevent branches from being merged if the conditions are not met