[Enhancement] Forested Highlands/Snowy Maple Forest Features

[davidjjung]

Describe your enhancement/improvement, with context and reasoning.

Hello! Have been looking through the data for Terralith for a while now, and I noticed that the forested highlands and snowy maple forest don't actually make use of the tree features detailed in configured_features/highlands/forest. Wasn't sure if it was an oversight or not, but currently both of these biomes use taiga trees instead. Attached below is an image of one pool of trees used in these biomes, along with a screenshot of the trees that are seemingly not used anywhere in the datapack.