feat: Add Notification and Details View

Week 9 -

• Add candidatesArray & modify objc object with List for candidates.
• Add getParticularElectionFromDb func to get election from database for the Details View
• Fix month calendar frame.
• Update year in month calendar.
• Add candidates to Detail View
• Modify startingDate & endingDate of Election model.
• Add mutating func for changeDays and Minutes for implementing Notifications.
• Update Create Elections.
• Add date formatter for JSON encoding for creating election.

Closes #28 (closed) #29 (closed) #27 (closed) testNotifications

Tests: