Make CockroachDB Kubernetes Operator Available on Helm

**Is your feature request related to a problem? Please describe.**
The CockroachDB Kubernetes Operator is not available on [Helm](https://helm.sh/docs/intro/install/). According to the CNCF 2020 Survey, it's the most popular tool for packaging apps on Kubernetes ([report](https://www.cncf.io/wp-content/uploads/2020/11/CNCF_Survey_Report_2020.pdf)).

**Describe the solution you'd like**
Similar to our older [Helm Chart](https://github.com/cockroachdb/helm-charts/), it would be ideal for customers to get the Operator and install it through Helm.

**Describe alternatives you've considered**
Our Operator is available on open-source and the Red Hat Marketplace. This builds on our growing set of channels to get it.

**Additional context**
This issue is a great first issue for new contributors. Feel free to reach out for additional questions.