Add ACK Amazon Managed service for Prometheus controller

[pdemagny]

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What is the outcome that you are trying to reach?

Hi, I'd like to add the ability to install the ACK Amazon Managed service for Prometheus controller.
This would allow users to create Amazon Managed service for Prometheus resources (AlertManagerDefinition, RuleGroupsNamespace, Workspace) with ACK.

Describe the solution you would like

Nothing fancy, following the same pattern as the other controllers is the way.

[pdemagny]

I would have asked in a discussion section but it looks like they are not opened here, so I'll ask here instead: Is it ok if I keep creating PR for more controllers ? ;)