feat: support authentication for rest-crud based APIs

[aaqilniz]

There is no way to apply authentication to rest-crud based APIs generated with lb4 rest-crud. This PR provides an idea and a basic implementation for achieving that.

Checklist

• [x] DCO (Developer Certificate of Origin) signed in all commits
• [x] npm test passes on your machine
• [x] New tests added or existing tests modified to cover all changes
• [x] Code conforms with the style guide
• [ ] API Documentation in code was updated
• [x] Documentation in /docs/site was updated
• [ ] Affected artifact templates in packages/cli were updated
• [ ] Affected example projects in examples/* were updated

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