Roodmus v0.3.0 utilities

[JatGreer]

Setting out the utilities and documentation envisioned to add for Roodmus v0.3.0

The utilities which will be present follow. Each will require sphinx documentation.

• conformations_sampling
• run_parakeet
• plot_ctf
• plot_picking
• plot_frames
• plot_classes
• plot_alignment
• write_starfile
• extract_particles
• het_metrics
• latent_clustering
• het_ensemblecomparison

In addition to documentation of Roodmus CL utilities, we need to ensure completeness in the repo wrt docstrings. And ensure all utilities are covered at least by integration tests.

Should consider unit tests for critical architecture, such as utils functionality, data classes, and particularly for metadata loading/saving.

Also, update the "internal" documentation, such as how version numbering is managed, merging to develop, merging to main and associated testpypi and pypi package updates.