[OLINGO-422] Select for server serializer
[OLINGO-422] Support for expand in server serializer
[OLINGO-422] Added ODataSerializerOptions
[OLINGO-422] More support for expand and select in ContextURL
[OLINGO-422] Minor code refactorings and fixes
[OLINGO-422] Merge branch 'OLINGO-422-SelectExpandSupport'