CCCMO: isolate provider specific logic within operator

Initial work was started there: https://github.com/lobziik/cluster-cloud-controller-manager-operator/pull/1/files

Need to isolate provider specific code in respective packages and introduce interface to leverage it (regular and bootstrap manifests rendering should be there atm)

DoD:

• Introduce templating logic to replace existing substitution mixture

• Isolate templating logic so that this is transparent to the core of the CCCMO
• Improve testing of the substitution