Feat/add sortable name to file tree

[colinricardo]

Checklist

• Fix linting errors
• Tests have been added / updated (or snapshots)

Change information

Currently the file tree component sorts based on the file/folder name.

However, this means that a file with name The file will come before than a file, since "T" < "a".

This PR adds an optional sortableName field, which allows us to pass in a lowercase name without modifying how the name is ultimately rendered.

An alternative approach would be to just do .toLowerCase() within the sorting functions, but this would change existing behavior, and some people may want default sorting to sort uppercase before lowercase.

Another approach would be for the file tree to be unopinionated about sort order (e.g. pass in a shouldSort?:boolean flag or similar.

First contribution, open to critiques!

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[colinricardo]

@unix informally tagging for review