Samplesheets settings

[nvnieuwk]

This pull request introduces a new feature that allows splitting samplesheet outputs by a specified field, enhancing the flexibility of samplesheet creation. It does so by adding a new samplesheets_settings field to the worksheet configuration, supporting a split_by option. The implementation includes updates to the worksheet and samplesheet handling classes, new tests, and documentation updates.

Key changes:

Feature: Configurable Samplesheet Splitting

• Added a new samplesheets_settings field to worksheet configuration files, supporting a split_by option to control how samplesheets are grouped and written to disk. [1] [2]
• Implemented the WorksheetSamplesheetsSettings class to validate and store samplesheet settings, including the split_by field.
• Updated Worksheet and WorksheetSamplesheets classes to accept and use the new settings, splitting samplesheet outputs accordingly when split_by is set. [1] [2] [3]

Testing and Utilities

• Updated and expanded tests to cover the new samplesheet splitting logic, including changes to test data and snapshot structure. [1] [2] [3] [4] [5] [6] [7]
• Added a new Utils class with helper methods for test snapshot generation.
• Adjusted test process logic to handle new output structure. [1] [2]

Documentation

• Updated CHANGELOG.md and README.md to document the new feature and bump the plugin version to 0.4.0. [1] [2]