Add a native datetime picker

[JuliaKirschenheuter]

resolves #1666

Working version with attributes value, min, max (types): date, datetime-local, month, time, week.

ToDo / Bugs for "upstream", native implementation are described in #1666

ToDo / Bugs to fix for "wrapper" - NativeDatetimePicker component:

• Check if input value is not allowed -> prevent NaN return value.
• Complete the documentation / check if it works well (right now i'm not able to build a documentation).

Screenshots:

[st3iny]

I tested briefly using our calendar app and left some feedback.

I thought we would replace the old DateTimePicker entirely instead of creating a new component. Are there specific reasons to create a new component and keep the old component?

[ChristophWurst]

Looks good otherwise. Didn't test.

[ChristophWurst]

Code looks good

[JuliaKirschenheuter]

I thought we would replace the old DateTimePicker entirely instead of creating a new component. Are there specific reasons to create a new component and keep the old component?

I would like to start slowly and won't create a big breaking change. Reason: a new picker have to be tested in several places / components. We could do this step a bit later.

[ChristophWurst]

A working demo can be found at nextcloud/mail#7123.

[juliushaertl]

Note we branched off a stable6 branch and master will be the next major only compatible with Nextcloud 25+, so if needed please backport this pr also to stable6.

[ChristophWurst]

/backport to stable6

[juliushaertl]

Looks good to me 👍

Just some non-blocking nit-picks

[ChristophWurst]

Let's do this