Feature request: easy access to support values on TreeNode

Feature request: easy access to support values on TreeNode: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm working with phylogenetic trees that have bootstrap / Bayesian support values attached to internal nodes (a very common situation — basically any tree…

The task

I'm working with phylogenetic trees that have bootstrap / Bayesian support values attached to internal nodes (a very common situation — basically any tree produced by RAxML, IQ-TREE, MrBayes, etc.). In Newick these usually show up as the internal node label, sometimes followed by `:branch_length`, e.g.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.