Adding filter context

See merge request !13

Adding "last_run" variable always updated to the last run of the harvester
Adding "context" function to access context variables
Improved logging

Added unitests

See merge request !12

general fixes

Closes #2 and #3

See merge request !11

moved temporal handling from opensearch to more generic function
added filter function now for pygeofiltering
removed one instance of abc for postprocessor
added back error handling from other branch to match recent updates

OADS Harvesting

See merge request !10

Put postprocess stuff into package
Allowing multiple postprocessors to be defined by using a list

added default queue

moved client away from main function due to handling it in the new app

updated fileharvester with some additional config
added structured logging
updated running daemon

resulting STAC Items

generate STAC Items.