Function idChildrenIJ

idChildrenIJ(
    face: Face,
    level: number,
    i: number,
    j: number,
): [blID: bigint, brID: bigint, tlID: bigint, trID: bigint]
Given a Face-level-i-j coordinate, get all its quad children tiles
Parameters
- face: Face
  the Face
- level: number
  zoom level
- i: number
  i coordinate
- j: number
  j coordinate
Returns [blID: bigint, brID: bigint, tlID: bigint, trID: bigint]
the child tile at that position