Update FeatureClassifier integration timescale and add secular timescale feature

[Ethadhani]

Made multiple changes that only affect FeatureClassifier

Changes are fully implemented in commit 5c4e548, changes include:

• Incorporated integrating to secular timescale from Yang & Tamayo 2024 as opposed to 1e4 orbits
• Added secular time scale and Tsec feature for the model
• Changed implementation of how features are generated
• Ensured model compatibility with new version of REBOUND
• Re-trained model with cleaned data and tested impact of duplications/mislabeling in original dataset
• Removed systems that go unstable in short integration from testing dataset
• Updated saved model
• New FeatureClassifier should have a higher AUC and a decreased FPR

Change comparisons, tests, and backwards compatibility

In paper_plots

• testUnstable.ipynb demonstrates change in AUC calculation to not include systems that go unstable in short integration
• cleanVnonClean.ipynb compares model trained with clean data verses not clean data.
• oldReboundNewRebound.ipynb compares old rebound verses new rebound
• compareTsec.ipynb in paper_plots folder contains Tsec integration, feature ablation study, and comparisons to old integration and features

commit 2a79a42 contains additional info and comparisons of:

• Old REBOUND to new REBOUND with training/testing
• Model trained with clean verses dirty data
• Initial Tsec tests

commit 9468319 contains comparisons for old feature generation implementation verses new implementation.

commit 086be72 contains all updates except for Tsec related integration and features, this version is avalable for backwards compatibility.

Data filtration/clean data generation is done in accordance to, and with the data from, 10.5281/zenodo.14327471