feat: add CloudNativePG

[gbartolini]

Pre-submission checklist:

Please check each of these after submitting your pull request:

• [x] Are you only including a repo_url if your project is 100% open source? If so, you need to pick the single best GitHub repository for your project, not a GitHub organization.
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• [X] Have you picked the single best (existing) category for your project?
• [x] Does it follow the other guidelines from the new entries section?
• [X] Have you added your SVG to hosted_logos and referenced it there?
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• [X] Does your project/product name match the text on the logo?
• [ ] Have you verified that the Crunchbase data for your organization is correct (including headquarters and LinkedIn)?

[gbartolini]

We do not have an entry in Crunchbase. Our goal is to apply again for the CNCF and donate the IP to the CNCF (currently the IP is owned by the CloudNativePG community).