refactor(reaction): refactored to an abstract reaction class in prep for weak reactions

utils/WRL/readme.md

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+# Unified Weak Rate Library
+This library was retrived on August 13th, 2025 from the following URL
+
+```bash
+wget https://groups.frib.msu.edu/charge_exchange/weakrate_tables/rate_table_Ravlic_others.txt
+```
+
+# Citations
+- A. Ravlic, S. Giraud, N. Paar, and R.G.T. Zegers, https://doi.org/10.48550/arXiv.2412.00650
+
+This is version 1.3 of the weak rate library. See
+[https://www.remcozegers.com/weak-rate-library](https://www.remcozegers.com/weak-rate-library)
+for details on versions 1.3, 1.2, and 1.1