Make fiona an optional dependency

[lispandfound]

Per title. Fiona is an annoying dependency because it doesn't have wheels built for the most recent version of pythons, and that requires GDAL to be installed. On clusters with module python dragged in as a dependency (e.g. RCH), this results in weird bugs that are hard to track down. Considering it is only used for the community fault model I believe making it an optional dependency is a better balance.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the project's dependency management by making the 'fiona' library optional. This change directly addresses recurring installation challenges caused by 'fiona's' reliance on GDAL, especially in complex environments like shared clusters. By allowing 'fiona' to be installed conditionally, the project enhances its usability and reduces setup friction for users who do not require its specific functionalities, such as those related to the community fault model.

Highlights

• Dependency Management: The 'fiona' library has been transitioned from a mandatory core dependency to an optional dependency. This change aims to alleviate installation issues, particularly those related to its underlying GDAL dependency, which can be problematic in certain environments.
• Configuration Update: A new optional dependency group named 'fiona' was introduced in 'pyproject.toml' to allow users to install 'fiona' only when needed, providing greater flexibility.

Changelog

• pyproject.toml
  • Removed 'fiona' from the main 'dependencies' list.
  • Added a new optional dependency group 'fiona' under '[project.optional-dependencies]'.

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[gemini-code-assist]

Code Review

This pull request aims to make fiona an optional dependency. While this is a good initiative, the PR is currently incomplete. It removes fiona from the core dependencies but does not include the necessary changes in the Python code to handle cases where fiona is not installed. This will lead to ImportError crashes for users who do not install the [fiona] extra. This critical issue needs to be addressed by adding error handling for the optional import.

[gemini-code-assist]

Removing fiona from the core dependencies without updating the code that uses it will cause the application to crash with an ImportError if fiona is not installed. Please add the necessary changes to the Python code to handle the optional import of fiona. This typically involves a try...except ImportError block where fiona is imported, and then gracefully disabling or providing an informative error for features that depend on it.