[Write | StartCandidateEvaluation -> CandidateEvaluationWasStarted] Implement slice

[MateuszNaKodach]

Blockers

• None!

Subtasks

• Implement whole slice with command and event.
• Try to describe subtasks as in previous write slices. Do it on your own! Good luck. Example: [Write | EmailConfirmation] create slice ApproveEmailConfirmation -> EmailConfirmationWasApproved #284

Event Modeling
MIRO: https://miro.com/app/board/o9J_lQvnN28=/?moveToWidget=3074457363653014520&cot=14