[HP-11] backend: provide backend for import cooperation functionality

[Vladyslav-Frolov]

POST cooperations/{id}/tasks
payload[
type: enum task type (import)
]

GET cooperations/{id}/tasks
GET cooperations/{id}/tasks/{task_id}
repose[
id: num
type: enum task type
status: enum status type
]

GET cooperations/{id}/tasks/{task_id}/file
POST cooperations/{id}/tasks/{task_id}/file
GET cooperations/{id}/tasks/{task_id}/report
repose[
Houses_amount:
Apartments:
Invitations:
]

Версионирование. Скритый лист с версией.
Предварительная валидация файла.

storage file: cloud storage S3 bucket

Implementation according to design #323