Datepicker

[MarkStruik]

Is your feature request related to a problem? Please describe.
Well I have a few reasons to select a specific date to use. Say a todo list for a specific date

Describe the solution you'd like
something like this:

Describe alternatives you've considered
not just allowing to input text and it being validated as date already is nice

[meowgorithm]

Hey! There's a PR for this open over here:
#76

Speaking of which, I'm going to transfer issue this to Bubbles accordingly.

[BOTbkcd]

Hi @meowgorithm, I designed a DatePicker component for my bubbletea app.

I also designed a more compact TimePicker component.

If you think they might be useful to others, I'll be happy to add a PR for them.