TSK-1682: Recruit Scripts, PoC based on Classes and Attributes

[anotherpit]

Proof of Concept for Recruitment Scripts, based on Platform's Classes and Attributes (instead of own custom data structures as it was in https://github.com/hcengineering/platform/pull/5240)

⚠️ Review but don't merge yet

_{Huly®: UBERF-6502}