feat: add a simple unparser for parsed search queries

To allow creating links with manipulated versions of the current search
query an unparser is necessary. However, the current output of ft_queryP

feat: add a simple unparser for parsed search queries

To allow creating links with manipulated versions of the current search
query an unparser is necessary. However, the current output of ft_queryParser
makes some advanced features hard to detect. Therefore the new
ft_queryUnparser_simple cannot handle negated phrases and `OR` searches.

It should still cover 98% of search queries.

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