As next step to migrate wazo-sysconfd

• migrate GET /delete_voicemail using fastapi (strange: GET for a delete…)

• migrate GET /move_voicemail using fastapi (strange: GET for a move…)

• execute successfully integration tests for /delete_voicemail

When done, branch should be merged in fastapi branch
Then when all modules will be done (not in this ticket), we will be able to merge fastapi in master

Note: endpoint name migration is optional and left to the developer