Make date range separator customizable

[vjik]

Is your feature request related to a problem? Please describe.

I want change symbol "-" to "—".

Describe the solution you'd like

New option rangeSepartor="—"

Describe alternatives you've considered

I don't know.

Additional context

[bbbxyz]

I was interested in something similar and i think this should be a fairly simple change to safeDateRangeFormat. I'll try to open a PR when I have time.

[github-actions]

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