Add symspell query #166
Description
In lnx 0.9.0 the fast-fuzzy query is implemented as a symspell lookup which then gets mapped into term queries.
However, we can be a bit smarter about this and attempt to fall back to an FST search with the same scoring approach for datasets
which are larger that what makes sense to pre-compute. Although this isn't faster, it does ensure behavior is consistent and has better relevancy.