Add `func subscribe` support to raw deployer

[creydr]

In #3075 we added the possibility to deploy a function as a raw Kubernetes deployment instead of a Knative Service. This deployment method currently does not support func subscribe.

[intojhanurag]

/assign

[intojhanurag]

Hey @creydr , Should I try to solve this issue ? I want to ship a feature tbh from so many days 😀. If anything else that i should know before starting this , Lmk .