Add advance templates to https://github.com/knative-sandbox/func-tastic

[dolfolife]

the func-tastic repo represents a list of templates ready to go for complex function architecture.

We have https://github.com/vmware-tanzu/function-buildpacks-for-knative/tree/main/samples which serve the same intent. A list of complex functional architectures. We want to centralize them into one place (func-tastic).

[bbtong]

This is not doable for the masses yet, as users who head towards func-tastic will presumably be using the latest builds of the func CLI. We do not support versions above 0.19, which means it will automatically fail for the time being.

This is due to func.yaml trying to strictly unmarshal fields that do not currently exist with our buildpack.

The issue that tracks this is #55 -- once that is resolved, only then this issue can be worked on.