feat: add luxon date adapter

[angelaki]

I'm switching my project from moment to luxon so I needed luxon support in your (great!) calendar control.

I'm not very familiar with package building but hope I've adopted all the necessary files for a correct luxon support. By the way, since your CalendarNativeDateFormatter uses the Intl object (and I guess for that reason there is no CalendarDateFnsDateFormatter), why is there even a CalendarMomentDateFormatter? Any reason to use it at all?

Thank you for checking, probably some fixing ;) & deploying! :)

[angelaki]

Guess it sure doesn't work, yet. But what does that line in the old moment dateAdapter even do?

angular-calendar/projects/angular-calendar/src/date-adapters/moment/index.ts

Line 6 in 4b34012

...baseAdapterFactory(moment),

Just copied it - but actually don't get it.

[mattlewis92]

This is really great work, thank you!

Can you also add an example, you can copy from the moment one:

https://github.com/mattlewis92/angular-calendar/tree/main/projects/demos/app/demo-modules/moment

[mattlewis92]

Let's bake this into the dateAdapters object and avoid the branching logic e.g.

const dateAdapters: Record<Schema['dateAdapter'], {version: string, adapterName: string}> = {
      moment: {
        version: momentVersion,
        adapterName: 'momentAdapterFactory'
      },
      'date-fns': {
        version: dateFnsVersion,
        adapterName: 'adapterFactory'
      },
      luxon: {
				version: luxonVersion,
				adapterName: 'luxonAdapterFactory'
			},
    };

Then here we can just pass dateAdapters[options.dateAdapter].adapterName;

[mattlewis92]

Let's add some tests for this based on the moment ones:

https://github.com/angelaki/angular-calendar/blob/7740d9aa0faba3e87604abec3c5e25f3944ff6b9/projects/angular-calendar/schematics/ng-add/index.spec.ts#L59-L67

https://github.com/angelaki/angular-calendar/blob/7740d9aa0faba3e87604abec3c5e25f3944ff6b9/projects/angular-calendar/schematics/ng-add/index.spec.ts#L124-L148

[mattlewis92]

To make this work you'll need to add a new date adapter here:
https://github.com/mattlewis92/calendar-utils/tree/main/src/date-adapters

and add it to the tests here:
https://github.com/mattlewis92/calendar-utils/blob/2f293a291f8fbc4da7b4022a4f562d043772755f/test/calendar-utils-utc.spec.ts#L53-L67

[mattlewis92]

By the way, since your CalendarNativeDateFormatter uses the Intl object (and I guess for that reason there is no CalendarDateFnsDateFormatter), why is there even a CalendarMomentDateFormatter? Any reason to use it at all?

I can't remember the exact reasoning, but I think at the time the Intl API was really buggy in most browsers (which was why angular moved away from it), so I added moment as a "stable" alternative. I think nowadays angular are looking to move back to the Intl api so I guess it got better and having the other date formatters makes less sense.