Add workflow for hz operator image release

[mtyazici]

Added workflow for Hazelcast-operator and Hazelcast-enterprise-operator Docker Hub release. It does the following:

• Install all dependencies to complete the process
• Downloads the Hazelcast Helm chart and overwrites some fields in statefulset.yml and values.yml
• Generates operator files, then the operator image
• Updates the values in files that are used for deployment test in Kubernetes.
• Sets up a Kubernetes in Docker(Kind) environment
• Deploys operator image into Kind, and waits for it to be ready
• Deploys Hazelcast members and a management center, and waits for all of them to be ready
• Checks the cluster size by looking at the log of the last Hazelcast member
• Checks the management center logs to verify members can talk to the management center
• Creates Dockerhub operator bundle and uploads it as an artifact
• Pushes the operator image to Docker Hub
• Updates the versions the hazelcast-operator repo and creates a PR for the changes
• Pushes new operatorhub bundle to DevopsHelm/community-operators fork, creates a PR for operator-framework / community-operators

[mtyazici]

New workflow run outpus is here: https://github.com/mtyazici/hazelcast-operator/actions/runs/382736551. It fails because I didn't give docker-hub credentials. However it builds everything correctly.