Split TimeScaleOptions sub types into smaller types

[etimberg]

Feature Proposal

I am working on an integration where the existing code created the time options for the scale separately. Because there is no exposed type for this object, I had to use a work-around. It should be straightforward to create an intermediate type that is exposed

Workaround

import { type TimeScaleOptions } from 'chart.js'

const time: TimeScaleOptions['time'] = {
  unit: 'day'
}

Possible Implementation

Refactor https://github.com/chartjs/Chart.js/blob/master/src/types/index.d.ts#L3329-L3364 out into an exposed type

[etimberg]

@kurkle @LeeLenaleee @dangreen @igorlukanin thoughts on this kind of change?

[LeeLenaleee]

Don't have any objections against it