Add support for suggestion of task names when the name has been mistyped

The goal is to make it friendlier to the user, by showing task names that are similar to what the user typed when nothing is found.

Things to consider:

- built in collections
- plugins

Start by locating the CLI path that handles a missing task name and trace how task names are gathered. Check both built-in collections and plugins when determining similar names. Done means a mistyped task produces useful suggestions, while an unmatched name still reports the failure clearly.

Written by the indexing model from the issue text.