Generate OLM bundle for devfile registry operator

[johnmcollier]

Fixes devfile/api#395

This PR generates the OLM bundles for the Devfile Registry Operator.

• Creates the generated OLM bundles and corresponding bundle image for the Devfile Registry Operator
  • Required bumping the operator's PROJECT version from 3-alpha to 3
• Bundle image is named quay.io/devfile/registry-operator-bundle
• Updates the CI workflows to build the operator bundle, as well as to push the bundle image to quay.io
• Some manual tweaks to the ClusterServiceVersion (CSV) file
  • Added a brief name and description for the operator. We can add to it later as needed, so I just put a stub description for now, since we aren't onboarding to OperatorHub just yet
  • Added a sample DevfileRegistry CR example to the CSV
  • Added the devfile logo (in base64 form).
  • Listed myself as the maintainer and listed Red Hat as the "provider"
  • Added the following keywords: - devfile, devfiles, registry, cloud-native, stack, odo

Once this is merged and we have bundle images push to quay.io/devfile/registry-operator-bundle, I'll update the OpenShift CI to test using the OLM bundle instead.

[GeekArthur]

LGTM

[openshift-ci-robot]

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This pull-request has been approved by: GeekArthur, johnmcollier, maysunfaisal

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