refactor!: rename count methods for consistency

[SupposedlySam]

Reason for Change

refactor!: renames count and streamCount to countAll and streamCountAll

Be more explicit, aligns with other methods such as readAll and streamAll, and leads us to look for other options like countWhere and streamCountWhere when using it in our apps.

Proposed Changes

Rename count and streamCount to countAll and streamCountAll

Type of Change

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

Checklist

• [ ] Readme Updated
• [ ] Example project updated
• [x] Tests added/updated
• [x] Changelog updated
• [x] Pubspec version updated