Convert to NCC build process (#1)

[jzylks]

In GitHub's JavaScript Action documentation, they recommend using @vercel/ncc to compile code for use in an action. This has a few advantages over the current method of creating tags that include node_modules and lib:

• Developers don't have to make changes to .gitignore for a release.
• The output of ncc is much smaller: less than 6 MB, compared to about 135MB for the current method.
• The compiled action can be kept up to date in branches while work is being done, allowing outside users to test changes to the action that are under development without forking and releasing their own action. Developers can use a simple pre-commit hook to make sure the compiled javascript stays up to date as they make changes:

#!/bin/sh
./release.sh
git add dist

This PR:

• Adds @vercel/ncc dependency to package code in dist/index.js
• Locks the engine to Node 16 so that any release built with @vercel/ncc will match the environment defined in action.yml
• Updates release.ps1 and adds a new release.sh script that will install dependencies from package-lock.json, build the application, and compile to a single index.js file with @vercel/ncc
• Adds a GitHub Actions workflow to check that the code in dist/ is up to date
• Updates action.yml to use dist/index.js instead of lib/main.js

[github-actions]

This PR is idle because it has been open for 14 days with no activity.

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