Add docstrings and type hinting to Data Retrieval, Config & Non-workflow Utilities

[virio-andreyana]

Closes #1836 and #1837

Changes proposed in this Pull Request

This PR aims to add docstring and type hinting to these scripts:

• scripts/retrieve_databundle_light.py
• scripts/download_global_buildings.py
• scripts/process_cost_data.py
• scripts/build_test_configs.py
• scripts/copy_config.py
• scripts/non_workflow/databundle_cli.py (No changes made here)
• scripts/non_workflow/zenodo_handler.py
  • This script is 3 years old and I'm not so sure how often it is used

Both zenodo_handler.py and zip_folder.py are both scripts with configuration within the script itself. We can choose based on how often people use this of either:

1. Creating a dedicated CLI or at least a YAML file to execute this script
2. Delete them

Checklist

• I consent to the release of this PR's code under the AGPLv3 license and non-code contributions under CC0-1.0 and CC-BY-4.0.
• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented, including updates to docstrings for meaningful functions.
• Newly introduced dependencies are added to envs/environment.yaml and doc/requirements.txt.
• Changes in configuration options are added in all of config.default.yaml and config.tutorial.yaml.
• Add a test config or line additions to test/ (note tests are changing the config.tutorial.yaml)
• Changes in configuration options are also documented in doc/configtables/*.csv and line references are adjusted in doc/user-guide/configuration.md and doc/tutorials/electricity-model.md.
• If config sections were added, renamed, or removed, update doc/assets/scripts/extract_config_snippets.py accordingly.
• Archives of the uploaded data do not have an enclosing folder and archive names correspond to the conventions of configs/bundle_config.yaml.
• A note for the release notes doc/release-notes.md is amended in the format of previous release notes, including reference to the requested PR.