* add to utils init
* refactor in io.py lines.py regions2d.py

* rename check_files to check_file_extension_existence and do necessary refactoring in other files
* remove part where we check for list: we are checking for only that of .evr and .evl and nothing else (this was initially added here because I was checking for both .zarr and .nc files in the same object, but that has now been removed)
* change to just check for file: no longer checking for directory, file must be of single evl or evr
* used re instead of ends with for file extension checking
* added description for check_file_extension_existence

* functionality to read from evl and evr files from the cloud
* no tests yet and no information regarding any S3 buckets and such
* will put this on hold and come back to it another time

for more information, see https://pre-commit.ci

* replace check_file with newer check_file_extension_existence