Feature Request: Support accepting RAM share invitations

[rhysxevans]

Is your feature request related to a problem?
The RAM controller only supports creating outgoing shares, not accepting incoming share invitations from other accounts.

Describe the solution you'd like
Add a ResourceShareAccepter CRD that accepts RAM share invitations.
Example:

   apiVersion: ram.services.k8s.aws/v1alpha1
   kind: ResourceShareAccepter
   metadata:
     name: accept-shared-resources
   spec:
     shareARN: arn:aws:ram:us-east-2:111122223333:resource-share/abc-123

Implementation

• Create → Accept pending invitation
• Read → Get invitation status
• Delete → Disassociate from share
• Follows Terraform's aws_ram_resource_share_accepter pattern

Describe alternatives you've considered
Manual acceptance
kubernetes job etc that runs aws cli commands

[github-actions]

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