feat: user attribute mutator/accessor & ToLowercase middleware

[gianfranco-rocco]

⚡ Modify Laravel boilerplate to make emails not case-sensitive - 86dqz4tcp ⚡

💻 What type of change is this?

• 💎 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Styling
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build / CI

⭐ Description

• Added attribute mutator & accessor to transform the value of the email field to lowercase
• Created middleware to allow transforming fields of the incoming request to lowercase

✅ Checklist

• This PR can be merged (it is not a draft, work in progress, or blocked on another PR)
• I have tested this change locally in multiple screen sizes
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules