apis: Move back to pkg/apis

[vkareh]

Since the operator-sdk expects types to be in the pkg/apis directory, we move them back and ensure that there is a go.mod file to allow importing this directory individually.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci[bot]]

@vkareh: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/validate	869f34c691e9a5d3a38cbcff2013d4c029c88c72	link	/test validate

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[openshift-ci[bot]]

@vkareh: PR needs rebase.

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[drpaneas]

Fixed in https://github.com/openshift/aws-account-operator/pull/580/files