Pass in additionalTags via the config to aid in billing and other tag use cases

[nicolehanjing]

As we discussed in bi-weekly AWS cloud provider meeting, we need to keep the tag format kubernetes.io/cluster/<clusterID> = shared|owned for discovery
Pass in additionalTags via the cloud config to aid in billing and other tag use cases

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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