feat: added alertmanager client package

[atighineanu]

Hi everyone.

To finish this PR, I'd need more input on what kind of features for the alert manager client would you like to have. In the alert manager documentation one can set up tls, authentication. I've created an empty http.Client and would need more info about:

• any token authentication for alert manager ?
• tls ? e.g. https scheme when calling the api
• additional flags? at least the ones I though of would be: alert manager url, token(if needed), http/https

The client does (so far) only two things: (tested on an alert manager inside a kind cluster) Status().Get()

Silences().Get()

Thanks

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This PR was automatically considered stale due to lack of activity. Please refresh it and/or join our slack channels to highlight it, before it automatically closes (in 7 days).