[Register Service] IGoogleServiceAccount is defined in register-core

IGoogleServiceAccount is defined in register-core. This forces the providers to define bean of type IGoogleServiceAccount. This interface should not exist in the core code.

package org.opengroup.osdu.register.utils;

public interface IGoogleServiceAccount {

    String getIdToken(String keyString, String audience);
    String getPrivateKeyId(String keyString);
}