Improve SecretTemplate to create secrets from different namespaces

**Describe the problem/challenge you have**
We can create secrets from different Namespaces with SecretTemplate

**Describe the solution you'd like**
Enable option in metadata to add namespace
---
Vote on this request

This is an invitation to the community to vote on issues, to help us prioritize our backlog. Use the "smiley face" up to the right of this comment to vote.

👍 "I would like to see this addressed as soon as possible"
👎 "There are other more important things to focus on right now"

We are also happy to receive and review Pull Requests if you would like to work on this issue.