[Feature] `eksctl update accessentry` to update already existing Access Entries

[AmitBenAmi]

What feature/behavior/change do you want?

eksctl update accessentry that will update existing Access Entries with new properties.

The aws eks cli already support this API with some options - https://docs.aws.amazon.com/cli/latest/reference/eks/update-access-entry.html

Why do you want this feature?

I find multiple use-cases of updating an existing Access Entry, such as:

• Adding another kubernetesGroup
• Adding another namespace to the scoped namespaces
• Adding another Access Policy

Today it either needs to be done:

1. aws cli
2. AWS Console
3. Delete and Re-Create the Access Entry, which might cause downtime

[github-actions]

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