Add ability to provision administrator credentials for basic authentication.

Current Casablanca authentication accepts any provided credentials.

CMSO was called out due to security exposure due to com.fasterxml.jackson.core:jackson-databind:2.9.7 Adding this authentication will mitigate this exposure as basic authentication would ensure messages processed by Spring Boot are from trusted sources. 

This fix will be required to support  OPTFRA-386. Otherwise, there is no real exposure with CMSO running in standalone mode.  

This issue will be mitigated by implementation of AAF which is to be implemented in the Dublin release. OPTFRA-390.