Expose extraVolumes and extraVolumeMounts in the addon configuration

[orsenthil]

What would you like to be added:

In the VPC CNI helm charts, we provide two fields

extraVolumes 	Array to add extra volumes 	[]
extraVolumeMounts 	Array to add extra mount 	[]

chart: Add extraVolumes and extraVolumeMounts #1949

#1949

This is not exposed by VPC CNI addon configuration. We need expose these via Addon Configuration too.

aws eks describe-addon-configuration --addon-name vpc-cni --addon-version v1.18.5-eksbuild.1 | jq -r '.configurationSchema' | python3 -m json.tool |grep -A3 -B3 extra

output

                "env": {
                    "$ref": "#/definitions/Env"
                },
                "extraEnv": {
                    "type": "array"
                },
                "init": {

Why is this needed:

Adding this Addon configuration will help customers use these fields.

[orsenthil]

This will be available in upcoming release VPC CNI 1.19.2-eksbuild.5

[orsenthil]

The extravolumes and extraVolume mounts are exposed in VPC CNI. 1.19.2-eksbuild.5

$ aws eks describe-addon-configuration --addon-name vpc-cni --addon-version v1.19.2-eksbuild.5 | jq -r '.configurationSchema' | python3 -m json.tool |grep -A3 -B3 extra
                "env": {
                    "$ref": "#/definitions/Env"
                },
                "extraEnv": {
                    "type": "array"
                },
                "extraVolumeMounts": {
                    "type": "array"
                },
                "extraVolumes": {
                    "type": "array"
                },
                "init": {

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