NXCALS-970 Service client as client search API

I know it is a lot, but most of the changes are really just using InternalServiceClientFactory instead of ServiceClientFactory.

No we have to sets of interfaces for servcies: InternalService Service

Service contains public methods InternalService extends Serivce and contains public methods too, as the name is self-explanatory it should be only used for internal use.

Providers implements InternalService but are package-private so cannot be imported outside of the package.

The only possibility to have the instance of InternalService or Service is through factories: InternalServiceClientFactory ServiceClientFactory

Edited by Marcin Lukasz Majewski

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