a new flag `--cluster-alias` for `eks update-kubeconfig`

### Describe the feature

add a new flag for setting `cluster` name for `eks update-kubeconfig`

### Use Case

i turn up and tear down frequently to learn eks.
for mgmt my kubeconfig, i want to set cluster, context and user as simple name over cluster's arn.
there are flags for each cluster and user , `--alias` and `--user-alias`, but no for cluster.

### Proposed Solution

add a flag `--cluster-alias` for `eks update-kubeconfig`.

usage like:
```sh
export AWS_PROFLIE=YOUR_PROFILE
export CLUSTER_NAME=YOUR_CLUSTER_NAME

aws eks update-kubeconfig --name $CLUSTER_NAME \
--alias $AWS_PROFILE@$CLUSTER_NAME \
--user-alias $AWS_PROFILE \
--cluster-alias $CLUSTER_NAME
```

### Other Information

_No response_

### Acknowledgements

- [X] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CLI version used

aws-cli/2.13.13 Python/3.11.4 Darwin/22.6.0 exe/x86_64 prompt/off

### Environment details (OS name and version, etc.)

macOS 13.5.2(22G91)