feat: Added & refactored sharing endpoints

[frederikpyt]

Description

• Added a /api/item/shared endpoint
  • This returns all items which are shared to the user calling the endpoint
• Added a /api/item/:id/sharings endpoint
  • This returns all the sharings of an item and the owner
• Refactored the add sharing endpoint to use email instead of userId

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

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
backend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 11, 2023 3:40pm

[github-actions]

Coverage report

❌ An unexpected error occurred. For more details, check console

Error: The process '/usr/bin/git' failed with exit code 128

St.❔	Category	Percentage	Covered / Total
🟢	Statements	100%	835/835
🟢	Branches	100%	105/105
🟢	Functions	100%	146/146
🟢	Lines	100%	799/799

Test suite run success

201 tests passing in 37 suites.

Report generated by 🧪jest coverage report action from db0de0e

[kristianbinau]

🏎️ Nice work!