Improved parallelization and PBT algorithm

Parallelization is improved leveraging new Runner (#684) and a shared algorithm state (#786).

🚀 Features

• PBT implementation @bouthilx (#705)

🏗 Enhancements

• Shared algorithm status @bouthilx (#786)
• Fix get_prior_string [#774] @Delaunay (#776)
• Replace np.object by object; np.object is deprecated @Delaunay (#773)
• Update backend_plotly.py @Delaunay (#772)
• Rework workon @Delaunay (#684)
• Print version on debug verbosity level @nurbal (#765)
• Remove ParallelStrategies from Producer and make them reusable modules for algorithms instead. @bouthilx (#760)

🐛 Bug Fixes

• (re) Fix parsing of hps with "." in name from commandline @lebrice (#785)
• Fix multiprocess del guard @Delaunay (#784)
• Replace exp's stat dict by a dataclass @bouthilx (#771)
• replace count by count_documents #706 @Delaunay (#707)

📜 Documentation

• Escape the escape @Delaunay (#783)

🧰 Maintenance

• Fix Track requirement URL for github @bouthilx (#761)