Fix/25 fss filter solutions

[chrisbc]

closing #25

• creates a solution/rates.csv file in FaultSystemSolution, with values taken from Aggregate rate_weighted_mean
• make it possible to create new archive from exiting, cloning reference data if it exists. Useful for buildinn filtered solutions

[codecov-commenter]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (2e89ef7) 90.21% compared to head (b4187aa) 90.68%.

Files	Patch %	Lines
solvis/inversion_solution/composite_solution.py	50.00%	1 Missing and 2 partials :warning:
solvis/inversion_solution/inversion_solution.py	66.66%	2 Missing and 1 partial :warning:
solvis/inversion_solution/fault_system_solution.py	92.85%	1 Missing and 1 partial :warning:
...lvis/inversion_solution/inversion_solution_file.py	91.66%	1 Missing and 1 partial :warning:
...s/inversion_solution/fault_system_solution_file.py	90.00%	0 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #27 +/- ## ========================================== + Coverage 90.21% 90.68% +0.47% ========================================== Files 14 14 Lines 787 816 +29 Branches 60 67 +7 ========================================== + Hits 710 740 +30 + Misses 68 65 -3 - Partials 9 11 +2 ```

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