feat: Remove unwanted rule prefer-returning-shorthand

[MaximeRougieux]

Status

READY

Description

• Remove the prefer-returning-shorthand rule
  We prefer

MyClass get myInstance => MyClass();

rather than

MyClass get myInstance => .new();

• Document support for dcm 1.35 (no changes because no new rules)

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore