[Task] implement get data by week/weekdays functionality

[scottgullaksen]

The current generic get_data function does not allow for this behaviour, extend!

Considerations

• [x] Extend get_data from reader.py or seperate functions? Are they interoperable?? Edit: yes, simply filter out the paths that correspond to e.g. mondays from the get_paths methods

Todo

• [x] Extend get_data with filter function for weekdays

[scottgullaksen]

Idea:

• [x] Get all relevant years months -> filter by relevant weekdays
• [x] week number realy not that useful

Maybe not neaded in reader.py?