to discuss: logging

[simonwoerpel]

Some parsers log progress (e.g. every X parsed rows) and information about parsed files, some others do nothing. We should define a pattern and apply to all parsers.

Suggestion (as seen in the corpwatch parser):

• log file name on start of parsing a specific file
• then log every 100.000 rows/records
• log finished count of records for this file
• repeat
  This allows to keep track how source file sizes develop over time and to spot data source errors.

[pudo]

One aspect to consider here: GitHub Actions has a tendency to kill jobs that don't print any output for an extended period. So we should output something, every now and then.