Bc-utils

* restructured config, exchange specifies tick date and eod date

* now downloads hourly and daily prices to separate files, eg Day_GOLD_20230200.csv, Hour_GOLD_20230400.csv
* better logic for handling periods with no or low data
* new script to update previously downloaded files
* new script to separate files from previous versions into split frequency files
* example code
* tests against Python 3.10
* black

* newer and renamed instruments in config
* publish with token
* latest github action versions
* fixing lint warnings
* fixing deepsource warnings