Auto merge of #2697 - Vanille-N:borrow-tracking, r=RalfJung

Reorganizing `stacked_borrows` in anticipation of a different model

These commits reorganize all the code inside the former `stacked_borrows` module and extract the part that really is specific to Stacked Borrows inside the `borrow_tracker/stacked_borrows` submodule.
Everything not specific to SB is put in `borrow_tracker/mod.rs`.
This is so that the future Tree Borrows model can be later added as a second submodule and reuse all the contents of `borrow_tracker/mod.rs`.

This reorganization is accompanied by renamings, mostly from "stacked borrows" to "borrow tracking".

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