add option to pass tags as parameter to apply to aws resources

[vamsinm]

when using terraform module the resources created will not have any resource tags. in most cases organizations need certain mandatory tagging for billing or categorizng resources to particular application or team. this PR will in clude tags as parameter so they can be passed to module.

#8

[vamsinm]

@bardielle @gdbranco would you mind reviewing this PR? thank you!

[vamsinm]

@bardielle thank you for the review. updated as suggested.

[bardielle]

@gdbranco please review it also

[bardielle]

/lgtm

[romfreiman]

Lets have jira ticket prefixing the title

[vamsinm]

@bardielle @romfreiman just checking to see if there is anything needed on this to approve merge?

[bardielle]

@arendej asked to discuss this PR on our next sync meeting.

"Currently, ROSA only accepts tags at install time. We await a feature from OCP in order to have the cluster reconcile tags as day2 parameters.
We should discuss this one.
It makes sense to allow tagging for resources part of the AWS TF provider resources, but not quite the same for ROSA/OCM resources, where tagging is reconciled with OCM." 

I will update you @vamsinm with the conclusions

[vamsinm]

thank you @bardielle ! this merge request does not refer any OCM resources. this terrafrom module is only generating AWS resources. is there a plan to include OCM resources in here?

[openshift-merge-robot]

PR needs rebase.

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