Senaite-queue

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- 21 Improve the reindex security objects process
- Skip guard checks when current thread is a consumer
- Make the creation of WS with WST assignment more efficient
- Pin cryptography==3.1.1
- Fix client's queue tasks in "queued" status are not updated when "running"

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- Support for multiple consumers (up to 4 concurrent processes)
- Added JSON API endpoints for both queue server and clients
- Queue server-client implementation, without the need of annotations
- Added PAS plugin for authentication, with symmetric encryption
- Delegate the reindex object security to queue when linking contacts to users
- 7 Allow to queue generic worflow actions without specific adapter
- 7 Redux and better performance
- 6 Allow the prioritization of tasks
- 5 No actions can be done to worksheets with queued jobs

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- Allow to manually assign the username to the task to be queued
- Support for failed tasks
- Notify when the value for max_seconds_unlock is too low
- 3 New `queue_tasks` view with the list of tasks and statistics
- 2 Add max_retries setting for failing tasks
- 1 Add sample guard to prevent transitions when queued analyses

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First version