Add a "sort" option to the ToC tree options

[eric-g-97477]

Context

When glob'ing files to be included in the TOC, it would be nice if their entries would be sorted by title.

Proposal

It would be nice to be able to do:

root: intro
subtrees:
- caption: Subtree Caption
  entries:
  - file: doc1
    subtrees:
    - sort: True
      entries:
        - glob: source-folder/**

and have the appearance of the files referenced by the glob in the TOC be based on titles and sorted.

Tasks and updates

No response