Support Scaleway instances

[demeringo]

Problem

Latest release of Boavizta API introduces data for scaleway instances.
https://github.com/Boavizta/boaviztapi/releases/tag/v1.3.4

Solution

Update cloud scanner to

1. Add an inventory of Scaleway instances
2. Returns corresponding impacts.

Alternatives

Additional context or elements

Unsure about best way to interract wth scaleway API, maybe using scaleway-api-rs ?

https://github.com/Qovery/scaleway-api-rs