[@mantine/dates] Add range type to DateTimePicker

[wuifdesign]

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Added type="range" to DateTimePicker as it is currently not implemented, but my be a nice feature in my opinion.

[Jules010209]

Hi, any news?

[wuifdesign]

updated to resolve merge conflicts with master

[rtivital]

Thanks for showing interest in contributing to Mantine! Unfortunately, this pull request cannot be accepted because of one of the following reasons:

• The proposed change has not been discussed with the maintainer – it does not fit the library in some way
• The proposed change is not wanted in the library or implemented incorrectly
• The PR is outdated or has errors in tests