Add New Entity: Surgery

[rosibaj]

• Surgery should have the same validation as other treatment tables (must be provided if treatment_type is surgery)

[rosibaj]

• discussed via slack
• the code will be commented out for surgery
• this ticket will be released commented out for capatain canuck
• follow-up ticket will be created to uncomment the surgery ticket.

[rosibaj]

followup ticket created: https://github.com/icgc-argo/argo-clinical/issues/727