fix(datepicker): pass through flatpickr inline prop

[tay1orjones]

Closes #5713

Passes the inline prop through to flatpickr. As stated in the linked issue, inline isn't something formally baked from a design standpoint but we shouldn't block teams from passing this through to meet their own unique use cases.

To this end, I didn't add inline as part of the component API, but instead passed it through by spreading ...rest props and checking for inline in componentDid/WillUpdate.

Changelog

Changed

• datepicker: pass through inline prop

Testing / Reviewing

• Tests should pass, inline should be able to be passed through to flatpickr from DatePicker

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[abbeyhrt]

Looks good to me! 🎉