Change the config-file handling so that the `timeout` and `itersize` entry will be correctly handled

The handling of the config file should be done as in exposure-share without reading each single entry but using the whole dictionary as parameter for the database initialization. Same as https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/exposure-initializer/-/issues/19 for Initializer.