Better support for search queries with double quotes

When you search on Listen Notes, you can use double quotes for exact match. But we had very limited support for using double quotes. Specifically, these queries were not working previously:

• Multiple pairs of double quotes, e.g., “elon musk” “tesla stock” didn’t do exact match for both “elon musk” and “tesla stock”.
• The entire phrase not inside double quotes, e.g., “elon musk” tesla stock didn’t do exact match for “elon musk”.

Now we support the above cases.