conditionGroupAND method
Implementation
Parser<GroupConditionAND> conditionGroupAND() =>
(ref0(conditionParenthesisOrValue) &
(string('&&').trim() & ref0(conditionParenthesisOrValue)).plus())
.map((l) {
var v1 = l[0];
var v2 = (l[1] as List)
.expand((e) => e is List ? e : [e])
.whereType<Condition>();
return GroupConditionAND([v1, ...v2]);
});