Add ECR controller support

[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 EC2 Container Registry controller.
This would allow users to create Amazon EC2 Container Registry resources (Repository, PullThroughCacheRule) with ACK.

Describe the solution you would like

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

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This issue has been automatically marked as stale because it has been open 30 days
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[github-actions]

Issue closed due to inactivity.