📦 Feature Request: Add script to download Case Study 1 sample data using `pooch`

[2320sharon]

📦 Feature Request: Add script to download Case Study 1 sample data using pooch

Description

To improve the onboarding experience for new users and make it easier to get started with CoastSeg, it would be helpful to provide a built-in way to download the sample dataset from Case Study 1.

This can be implemented as a new script or function that uses pooch to programmatically download the sample data. This allows users to quickly access and experiment with CoastSeg using a known dataset without needing to manually fetch and configure it.

Proposed Features

• Create a new utility script (e.g. download_sample_data.py or coastseg/utils/download_case_study_data.py)
• Use pooch to download all relevant files for Case Study 1
• Add appropriate documentation and example usage
• Integrate this into the documentation/tutorial to help users follow along

Motivation

• Lower barrier to entry for new users
• Consistency in how sample data is accessed
• Enables quick testing and validation of CoastSeg setup

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Credit: Idea originally from @dbuscombe-usgs