- Refactor the Target domain repository functions so that they no longer return 4 different types.
`Target` struct now contains `HostSource` & `CredentialSources` with Getters & Setters
- Extending `Target` to contain `HostSource` & `CredentialSources` enables `funcs` to just return `Target` instead of multiple return types.
This also allows easy future refactors and extensions of `Target`