update to 0.8.4, add follow-symlinks, fix idx family bugs

[fdncred]

Description

This PR updates idx dependencies and fixes the api due to changes introduced with fff-search 0.8.2. It also fixes a bunch of bugs recently identified.

User-facing changes (Release notes)

idx dependency update and command reliability improvements

Update the idx fff-search dependency and fix bugs.

• idx init . --wait now properly blocks
• idx init now has a --follow-links switch
• idx status reports accurate counts after indexing
• idx import fully restores snapshot for queries — The idx import command now properly restores snapshots to enable all query operations. Imported snapshots remain queryable even if the original project files have been deleted or moved.
• idx files works on imported snapshots
• idx files has a query parameter now for easy searching (renamed from path for consistency)
• idx dirs works on imported snapshots
• idx dirs has a query parameter now for easy searching
• idx find (fuzzy search) works on imported snapshots
• idx search (content search) works on imported snapshots
• changed output to nushell values for commands that return tables
• updated some help strings to be more helpful

Files are ignored during indexing due to the use of the ignore crate. These are the rules for ignore https://docs.rs/ignore/latest/ignore/struct.WalkBuilder.html#ignore-rules. There's no way to override this in the current version.

Additional notes