fdsnws-station query filter parameters for eidaws-stationlite

[damb]

With #12 eidaws-stationlite returns fully canonicalized stream epochs for service=station requests. However, endpoint requests can be further canonicalized by means of resolving as many query filter parameters as possible already at eidaws-stationlite, instead of forwarding those to the endpoints. Query filter parameters which still should be resolved at eidaws-stationlite include:

• the time parameters startbefore, startafter, endbefore, endafter
• includerestricted