ZQL

#### Usage example

``ts
const qb = new QueryBuilder();
qb.eq("sex", "male")

const or = qb.or()
or.like("name", "%lu%")
or.eq("status", 3)

const and = or.and()
and.gt("age", 18)
and.lt("age", 60)

qb.relation("feature").eq("status", 4).gt("created_at", new Date("2021-11-02T09:37:32.771Z"))

qb.page(10, 50)
qb.asc("id").desc("created_at")
const queryString = qb.Build()
console.log(queryString)
`

`json
{
"filter": [
{
"op": "eq",
"field": "sex",
"value": "male"
},
{
"op": "or",
"field": "",
"value": [
{
"op": "like",
"field": "name",
"value": "%lu%"
},
{
"op": "eq",
"field": "status",
"value": 3
},
{
"op": "and",
"field": "",
"value": [
{
"op": "gt",
"field": "age",
"value": 18
},
{
"op": "lt",
"field": "age",
"value": 60
}
]
}
]
}
],
"orders": [
{
"field": "id",
"direction": "asc"
},
{
"field": "created_at",
"direction": "desc"
}
],
"relations": {
"feature": {
"filter": [
{
"op": "eq",
"field": "status",
"value": 4
},
{
"op": "gt",
"field": "created_at",
"value": "2021-11-02T09:37:32.771Z"
}
]
}
},
"page": 10,
"per_page": 50
}
``