Integrate & update libDF as an inference library, add model path

[jacksongoode]

This strips the libDF from DeepFilterNet to exclusively include the code needed inference. It also provides a loading point for a model packaged as a tar.gz. Additionally:

• Removed non-inference files from the crate, keeping only tract.rs and lib.rs
  • Removed any dead methods that were used in other files
• Rust locked at 1.91
• Packages bumped to latest (and those that are specifically used by tonari are locked).
• Small changes for clippy formats and compatibility changes with new libs
• Info logs and excessive logging lowered to debug
• Added model path input

The last one is the main cleanup file. Since not much was really done, though there are quite a few changes the only meaningfully different change is the model path.

Note: This doesn't have to be merged, just for ease of review.