Fix nested filter arrays when a column receives 3+ values

[fzaninotto]

Problem

parseFilters checks Array.isArray(result[key]) instead of Array.isArray(result.filter[key]).
The check is always true, so from the third value on, the existing array gets wrapped instead of appended to:

• { 'q@ilike': 'a b c' } → { q: [['ilike.*a*', 'ilike.*b*'], 'ilike.*c*'] }
• inside @or, this yields an invalid logic tree: or=(q.ilike.*a*,ilike.*b*,q.ilike.*c*),
  which PostgREST rejects with failed to parse logic tree.

It affects any search with 3+ words, and any column with 3+ operators (e.g. age@gt, age@lt, age@neq).

Fix

Check result.filter[key]. Added tests for 3-word like, 3-word ilike inside @or, and 3 operators on one column.

[fzaninotto]

Hi, is there something missing in this PR?