Extend Etcd Encryption API and add more validations and defaults

[abhinavmpandey08]

Description of changes:
Extend Etcd Encryption API and add more validations and defaults with unit tests

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% 🎉

Comparison is base (8382d1a) 75.59% compared to head (46c4742) 75.64%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6708      +/-   ##
==========================================
+ Coverage   75.59%   75.64%   +0.04%     
==========================================
  Files         474      474              
  Lines       38250    38303      +53     
==========================================
+ Hits        28916    28973      +57     
+ Misses       7726     7723       -3     
+ Partials     1608     1607       -1     

Files Changed	Coverage Δ
pkg/api/v1alpha1/cluster_defaults.go	75.00% <ø> (ø)
pkg/api/v1alpha1/cluster_webhook.go	92.90% <100.00%> (ø)
pkg/api/v1alpha1/etcdencryption.go	100.00% <100.00%> (ø)
pkg/providers/vsphere/vsphere.go	68.82% <100.00%> (+0.39%)	⬆️

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[pokearu]

/test eks-anywhere-presubmit

[pokearu]

/lgtm
/woof

[eks-distro-bot]

@pokearu:

In response to this:

/lgtm
/woof

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[abhinavmpandey08]

/approve
/woof

[eks-distro-bot]

@abhinavmpandey08:

In response to this:

/approve
/woof

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhinavmpandey08

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