This PR changes two things:

• When creating keywords out of symbols for workspace_search, symbol names are now split at whitespace and flattened with the tags representing the types. This makes it possible to ever match multi-word symbols, which wasn't possibly until now because the query was whitespace split and the name wasn't. Now they both are.
• Filter the symbols based on any keyword containing, not being equal to, any word of the query. This way symbols show up properly as the user types the query without having to fully type out a word for the symbol to pop up.