Solvis

Fixed
- mfd_hist function updated for pandas v2 compatibility

Changed
- remove unnecessary poetry groups from pyproject.toml
- fix missing indices error
- *.to_archive() base_archive_path can None if we already have a valid self._archive
- internal changes to _archive representation (now BytesIO)
- remove unneeded opensha artefacts from FaultSystemSolution

Added
- FaultSystemSolution.to_archive() adds a solution/rates.csv file, with Annual rates from rate_weighted_mean aggregate.

Changed
- change class property names to clarify if rates are rupture rates or slip rates
- remove units from DataFrame column names

Added
- solution slip rate property and method (fault_sections_with_solution_slip_rates, get_solution_slip_rates_for_parent_fault)

Changed
- patch version bump for GHA changes

Added
- new solivs method parent_fault_names
- utility script for MFD calculaton checks