Ideas for new Laravel sniffs

[szepeviktor]

moved from https://github.com/InteractionDesignFoundation/coding-standard/blob/main/docs/ideas.md

• Validation rule syntax: don’t use user’s input in unique rule (security)
• Validation rule syntax: prefer an array instead |
• Facade vs helper classes
• Security: Don’t use user’s input for column names.
• Don't allow using mass-assignment from $request->all()