As an editor I want to query for data involving quantity values.
**Problem:**
We currently don't allow querying for values of Properties with datatype quantity. We should.
**Example:**
* people with an Erdős number of 1
**BDD**
GIVEN a visual query
WHEN selecting a Property of datatype quantity
THEN the value input accepts quality values
AND the query result contains only results including an exact match for the given value
**Acceptance criteria:**
[ ] queries with Properties of datatype quantity are possible
[ ] quantity values incl. and excl. units are possible
**Needed components:**
* [[ https://phabricator.wikimedia.org/T273001 | quantity input component ]]
**Notes:**
* We do not handle less than/more than etc. in this ticket, only exact matches. Ranges are handled in T272692.