Create service.json inside operator

Currently service.json is created using the command [ipfs-cluster-service init](https://github.com/ipfs-cluster/ipfs-operator/blob/main/controllers/scripts/config.go#L89) which makes it difficult to customize ipfs-cluster via modifying service.json file. 

Here idea is to create service.json inside the operator code and then attach it to ipfs-cluster container using configmap. 