const start=new Date('2000-01-01');
const end=new Date('2000-01-10');
splitIntervalByDuration({start, end},{days:1});
// [
// {start:2000-01-01, end:2000-01-02},
// {start:2000-01-02, end:2000-01-03},
// {start:2000-01-03, end:2000-01-04},
// {start:2000-01-04, end:2000-01-05},
// {start:2000-01-05, end:2000-01-06},
// {start:2000-01-06, end:2000-01-07},
// {start:2000-01-07, end:2000-01-08},
// {start:2000-01-08, end:2000-01-09},
// {start:2000-01-09, end:2000-01-10},
// ]
divide the given interval into smaller intervals, each having the duration equal to the given duration