fix: refactor retrieve_egon_data rule to use curl for data retrieval and ensure output directory exists

[yechenyan]

…and ensure output directory exists

Issue

I did not modify the configuration and ran the simulation using snakemake -call all --configfile=config/config.public.yaml. The following error was encountered:

The cause is as follows:

1. Since this is my first time running it, there is no data/egon folder, which will cause a wget -o error.
2. macOS and Windows systems do not have wget.

Solution

1. Create data/egon before downloading files.
2. Use curl to download files.

Before asking for a review for this PR make sure to complete the following checklist:

• Workflow with target rule ariadne_all completes without errors
• The logic of export_ariadne_variables has been adapted to the changes
• One or several figures that validate the changes in the PR have been posted as a comment
• A brief description of the changes has been added to Changelog.md
• The latest main has been merged into the PR
• The config has a new prefix of the format YYYYMMDDdescriptive_title

[lkstrp]

Thanks for the quick fix @yechenyan!

In general, wget is preferred over curl for downloading large files. On MacOS you can also just do brew install wget. But since these are not large files, it's fine. I am also not even sure why this was implemented via bash in the first place.