feat: List and form for observation time series

.../vips/logic/controller/servlet/ObservationController.java

...c/controller/servlet/ObservationTimeSeriesController.java

.../nibio/vips/logic/controller/session/ObservationBean.java

...s/logic/controller/session/ObservationTimeSeriesBean.java

src/main/java/no/nibio/vips/logic/entity/Observation.java

...ava/no/nibio/vips/logic/entity/ObservationTimeSeries.java

...ources/no/nibio/vips/logic/i18n/vipslogictexts.properties

...ces/no/nibio/vips/logic/i18n/vipslogictexts_nb.properties

src/main/webapp/WEB-INF/web.xml

src/main/webapp/formdefinitions/observationForm.json

...ain/webapp/formdefinitions/observationTimeSeriesForm.json

src/main/webapp/templates/master.ftl

src/main/webapp/templates/observationForm.ftl

src/main/webapp/templates/observationList.ftl

src/main/webapp/templates/observationTimeSeriesForm.ftl

src/main/webapp/templates/observationTimeSeriesList.ftl