Use the user's locale to determine the format of the date in the timestamp field's view

[emmatown]

Closes #6913

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@keystone-next/keystone	Patch
@keystone-ui/fields	Patch

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[gautamsi]

Why not provide config in timestamp field.

It was quiet good with datetime field in v5.

I would want to use the ate time dropdown and also humanize form of entry into the field (today at 5 pm)