Date picker and its integration in proposal interface

[nikitatrifan]

This is to add DatePicker to stateless/components/inputs and use it instead of text inputs where it's asking users to type in a date.

We already use mui in the codebase so why not leverage their date picker. Just adjust the styling to match for dao dao look and feel.

This also introduces dayjs for more seamless data manipulation and tailwindcss nesting to allow for this scss style of writing css.

To do:

• [ ] Storybook stories
• [ ] Do we want to leverage dayjs further and refactor date validation across the project cc @NoahSaso
• [ ] Test NewFormSurvey UX

Demo: https://github.com/DA0-DA0/dao-dao-ui/assets/11634956/48e39fdc-ab12-46e9-84c4-678656156224

[NoahSaso]

Closing in favor of #1804

Thanks for getting this going @nikitatrifan 🙏