Shadowserver Reports API Collector: Test key in init and check methods

[ghost]

To check the connnection to the API and the validity, the API can be queried for testing, e.g. using the test/ping or key/info endpoint

https://www.shadowserver.org/what-we-do/network-reporting/api-documentation/#user-content-keyinfo

[sebix]

@elsif2 maybe you want to pick up this proposal?

[elsif2]

Sure, please assign it to me (I can't assign it).

[sebix]

It looks like I can only assign you an issue after you posted a comment in that issue. Otherwise I can't select your account in the form :roll_eyes: