Refactor TEAMS find logic into separate method.

- Create find_team_by_key_value method which will take the property and value to search for.
- Ensure the comparison is down with case insensitivity.
- Fixed formatting issue with closing } for TEAMS hash.
Refactor TEAMS hash into array of Team objects.

- Create new Team class to store Team information.
- Include model classes first.
- Update methods in teams file to use updated TEAMS variable.