Add string sample logs

[alexhroom]

This PR adds the ability to filter sample logs which are strings. Fixes #70.

Also fixes a bug where sample log filters are filtered wrong in output files as apply_filters ignores whether the time filters are include or exclude, and adds some validation for sample logs when the filter is created rather than when it is calculated.

also now sorts sample log times. fixes #100

[Copilot]

🟡 Changes recommended

Missing-value filters can return all data, and transition timestamps are incorrectly included.

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Pull request overview

Adds string sample-log filtering, validation, and corrected filter handling in histogram/output generation.

Changes:

• Supports case-insensitive string predicates and HDF5 string logs.
• Sorts and applies include/exclude ranges correctly.
• Adds tests, plotting support, and documentation.

File summaries

File	Description
src/test_utils.rs	Adds mock sample-log creation.
src/stats.rs	Propagates log-filter errors.
src/interface.rs	Exposes string filtering.
src/filters/mod.rs	Exports predicates.
src/filters/api.rs	Adds string predicates and errors.
src/data/save/sample_logs.rs	Saves and filters string logs.
src/data/sample_logs.rs	Loads, filters, and sorts log ranges.
src/data/nexus_data.rs	Returns string logs to Python.
src/batch_interface.rs	Validates and applies string filters.
MNeuEventLib/plotting.py	Plots categorical logs.
docs/source/how-to/filtering.ipynb	Documents text filtering.

Review details

• Files reviewed: 11/11 changed files
• Comments generated: 2
• Review effort level: Balanced

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