Function idChildren

idChildren(id: bigint, orientation?: number): [bigint, bigint, bigint, bigint]
Given an S2CellID, get all the quad children tiles
Parameters
- id: bigint
  the S2CellID
- orientation: number = 0
  orientation of the child (0 or 1)
Returns [bigint, bigint, bigint, bigint]
the child tile at that position