Provide an official neostandard GitHub Action?

[voxpelli]

This could complement #33 / #2 and solve use cases like CheckerNetwork/spark-checker#95 where npx standard is used to run standard, without any prior package.json or such.

In a GitHub Action it would also be very easy to expose the same options as provided to neostandard itself

[bajtos]

There are similar GitHub Action for running Prettier and dprint:

• https://github.com/marketplace/actions/prettier-action
• https://github.com/marketplace/actions/actionsx-prettier
• https://github.com/marketplace/actions/dprint-check-action

A big benefit of running linters via a GitHub action instead of npx is the speed. The linting step is blazingly fast because all dependencies of the linter tool are already installed in the Docker image of the GitHub action.