Add test data generation script to `OpenSkillSharp.Tests`

[myssto]

Currently the data used for unit tests is statically available in OpenSkillSharp.Tests.Models.Data. This is also the case for the source python repo (and where it was originally sourced from for this repo), but the numbers themselves are actually able to be generated by the models directly and validated.

This script from the openskillpy repo should be ported (and made available to invoke via CLI?) https://github.com/vivekjoshy/openskill.py/blob/main/tests/models/generate.py