[Feature] add chart for in-memory-channel

### Name and Version

n/a

### What is the problem this feature will solve?

Another knative chart that should be migrated to helm.

### What is the feature you are proposing to solve the problem?

New chart called `in-memory-channel`

### What alternatives have you considered?

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct