feat: add score to milestones

### Additions

* added field `score: Int!` to `MilestoneType` type
* added field `achievedScore: Int!` to `TeamType` type
* added field `totalScore: Int!` to `TeamType` type
* added field `achievedScore: Int!` to `RestrictedTeam` type
* added field `totalScore: Int!` to `RestrictedTeam` type
* added field `achievedScore: Int!` to `TeamLearningObjectiveType` type
* added field `totalScore: Int!` to `TeamLearningObjectiveType` type
* added field `achievedScore: Int!` to `TeamLearningActivityType` type
* added field `totalScore: Int!` to `TeamLearningActivityType` type

Closes #402