[WIP][RW-969] Post API - api key per user

[attiks]

Still WIP

1. Add a "trusted user" reference field to the provider entity type (filled by the RW team after verification/agreement etc. with partner).
2. Add an API key field to users
3. Add a user route for a user to get a new automatically generated key (view once)
4. Add a user route for a user to see the providers they are trusted for (so they can get the provider UUID notably)
5. Update the provider entity to validate the API key against the API keys of the trusted users

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Statements:	15.32% ( 2123 / 13859 )
Methods:	19.83% ( 162 / 817 )
Lines:	15.04% ( 1961 / 13042 )

[github-actions]

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Pusher: @attiks, Action: pull_request, Workflow: Run tests

[orakili]

Looks good, thanks.