3.6 - Fulltext - MultiSort

[alexiudice]

• Adds multisort support for fulltext indexes. Functions through continuous tie-breakers.
• Updates 'searchNodes/searchRelationships' procedures.
• Adds multisort test.

On top of the pagination PR.

Fulltext indexes with sort are created in their usual way. The searchNodes/searchRelationships procedures have been updated to use a sortBy list of sorts to apply to the query:

CALL db.index.fulltext.searchNodes("personIndex", "*", 
{sortBy: 
    [
        {property: "born", direction: "ASC"},
        {property: "name", direction: "DESC"}
    ]
}) YIELD node, score RETURN *