Feature: Add feedstock_dir option for the EIA Natural Gas functionality

[RHammond2]

Add feedstock_dir option for the EIA Natural Gas functionality

This PR adds the feedstock_dir input option for the EIA natural gas downloading and configuration in place of just the filename using a complete file path. This change ensures the feedstocks and resources use similar APIs. In this case the FEEDSTOCK_DEFAULT_DIR / "natural_gas" will always be used as a default when a filename is provided.

Section 1: Type of Contribution

• Feature Enhancement
  • Framework
  • New Model
  • Updated Model
  • Tools/Utilities
  • Other (please describe):
• Bug Fix
• Documentation Update
• CI Changes
• Other (please describe):

Section 2: Draft PR Checklist

N/A

Section 3: General PR Checklist

• PR description thoroughly describes the new feature, bug fix, etc.
• Added tests for new functionality or bug fixes -- updated, no new tests
• Tests pass (If not, and this is expected, please elaborate in the Section 6: Test Results)
• Documentation
  • Docstrings are up-to-date
  • Related docs/ files are up-to-date, or added when necessary
  • Documentation has been rebuilt successfully
  • Examples have been updated (if applicable)
• CHANGELOG.md
  • At least one complete sentence has been provided to describe the changes made in this PR
  • After the above, a hyperlink has been provided to the PR using the following format:
    "A complete thought. [PR XYZ]((https://github.com/NatLabRockies/H2Integrate/pull/XYZ)", where
    XYZ should be replaced with the actual number.

Section 4: Related Issues

N/A

Section 5: Impacted Areas of the Software

Section 5.1: New Files

N/A

Section 5.2: Modified Files

• h2integrate/core/utils/file_utils.py
  • check_data_dir: Calls to Path.mkdir() now include parents=True to enable the creation of a nonexistent series of "feedstock" and "natural_gas" subdirectories when required.
• h2integrate/preprocess/eia.py
  • get_eia_ng_data: adds feedstock_dir, which if unprovided will default to h2integrate.FEEDSTOCK_DEFAULT_DIR / "natural_gas"
• h2integrate/feedstocks/eia_ng_price.py
  • EIANaturalGasFeedstockConfig: adds feedstock_dir, which if unprovided will default to h2integrate.FEEDSTOCK_DEFAULT_DIR / "natural_gas"

Section 6: Additional Supporting Information

Originally these changes were slated for #777, but the PR was merged prior to this addition following #791.

Section 7: Test Results, if applicable

Tests pass

Section 8 (Optional): New Model Checklist

N/A

[johnjasa]

Thanks Rob! I like these changes and appreciate your patience as I merge in PRs at varied paces.

[elenya-grant]

I saw this just got merged but wanted to comment this anyway:

Is my understanding of the logic correct:

• if filename is a full filepath and feedstock_dir is None, then it loads or saves data to filename
• if filename is a file name (string) and feedstock_dir is None, then it loads or saves data to FEEDSTOCK_DEFAULT_DIR/"natural_gas"/filename?
• if filename is None, data is pulled from the API (its not loaded from pre-existing data and not saved to a file)
• if feedstock_dir is a full folder path and filename is a string, it saves the data to feedstock_dir/filename