Update references to API Groups and list latest reviewed APIs

[ddebroy]

Updates:
[1] Reflect the current architecture in the diagram we plan to GA with.
[2] Update references to a single API group (CSIProxyService - which was obsolete) to the API Groups.
[3] The latest form of the API capturing all the updates from recent reviews (kubernetes-csi/csi-proxy#130, kubernetes-csi/csi-proxy#131, kubernetes-csi/csi-proxy#132, kubernetes-csi/csi-proxy#133)

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[jsturtevant]

/milestone v1.22

[ksubrmnn]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ddebroy, ksubrmnn

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[jsturtevant]

/lgtm