[FEATURE] Add support to DateTime props

**Is your feature request related to a problem? Please describe.**
As a Pipedream developer, I would like to have the possibility to create DateTime props. This way we can improve the UX for our clients. Maybe we can have three new components here. Date, Time, and DateTime

**Describe the solution you'd like**
We have pretty good solutions in NPM. I don't know if we use React on the platform front-end, if so, we have some good packages like https://www.npmjs.com/package/react-datepicker

**Do you have a workaround?**
Yeah, I can use string type for now

**Additional context**
In Reddit API for example, there are some timestamps fields that could use this new feature. For example https://www.reddit.com/dev/api/#POST_api_submit