Add search on synonyms in the QB

[CarolineDenis]

Fixes #752

Checklist

• Self-review the PR after opening it to make sure the changes look good
  and self-explanatory (or properly documented)
• Add relevant issue to release milestone

Testing instructions

• open query builder and select a tree table
• make a search on any rank
• add name field in the mapper line
• enter the name of a node that has a synonym for the value
• check the box search synonyms
• run the query
• verify that the node is being return as well as its synonym