[v0.30] Delete old and processed tasks

[brunoocasali]

This feature request is part of the new set of features introduced on Meilisearch v0.30.
Extracted from meilisearch/integration-guides#221.

Related to:

• issue: Delete old processed tasks meilisearch#2751
• spec: Tasks API - Add task deletion capability specifications#198

This issue aims to reduce the users' friction with disk size management by allowing them to delete the old processed tasks.

• A new endpoint: DELETE /tasks
• A new task type: taskDeletion
• Add deletedTasks in field details from Task type when performing taskDeletion
• A new API key action: tasks.delete
• Guarantee all the filters available in the GET /tasks but from and limit are available.
• Add uids filter. e.g /tasks?uids=1,2,3,4 (⚠️ only effective after RC1)
  • error code in case of failure: invalid_task_uids_filter
• Add canceledBy filter. e.g /tasks?canceledBy=99,100
  • error code in case of failure: invalid_task_canceled_by_filter
• Add beforeEnqueuedAt and afterEnqueuedAt. e.g /tasks?afterEnqueuedAt=2022-01-20&beforeEnqueuedAt=2022-01-23
• Add beforeStartedAt and afterStartedAt. e.g /tasks?afterStartedAt=2022-01-20&beforeStartedAt=2022-01-23
• Add beforeFinishedAt and afterFinishedAt. e.g /tasks?afterFinishedAt=2022-01-20&beforeFinishedAt=2022-01-23
• Add code delete_tasks_1 into this file
  This code sample should show an example of the corresponding curl command, but with swift code:

curl \
    -X DELETE 'http://localhost:7700/tasks?uids=1,2'

General recommendations to implement this issue:

• Check the TasksQuery.swift as an example.
• Make sure your DeleteTasksQuery class implements Queryable protocol.