wip: add aiven-operator

[mhoffm-aiven]

Thanks submitting your Operator. Please check below list before you create your Pull Request.

New Submissions

• Are you familiar with our contribution guidelines?
• Have you packaged and deployed your Operator for Operator Framework?
• Have you tested your Operator with all Custom Resource Definitions?
• Have you tested your Operator in all supported installation modes?
• Have you considered whether you want use semantic versioning order?
• Is your submission signed?
• Is operator icon set?

Your submission should not

• Modify more than one operator
• Modify an Operator you don't own
• Rename an operator - please remove and add with a different name instead
• Modify any files outside the above mentioned folders
• Contain more than one commit. Please squash your commits.

Operator Description must contain (in order)

1. Description about the managed Application and where to find more information
2. Features and capabilities of your Operator and how to use it
3. Any manual steps about potential pre-requisites for using your Operator

Operator Metadata should contain

• Human readable name and 1-liner description about your Operator
• Valid category name¹
• One of the pre-defined capability levels²
• Links to the maintainer, source code and documentation
• Example templates for all Custom Resource Definitions intended to be used
• A quadratic logo

Remember that you can preview your CSV here.

[ivan-savciuc]

Please rename or squash commit with this message wip: add aiven-operator