Contributes to #1252

Major changes:

• Store startDate and endDate using YYYY-MM-DD format in Redux store.filters
• Add createdDateMs to Redux store.data.requests
• Add dateFilter to RequestsLayer to filter by createdDateMs
• Update Redux store when ReactDayPicker picks new days for the date range

As noted in the title, the date range filtering will only work on date ranges within the past week, since we are currently only getting data from the past week. In the future, I will make another PR that gets more data if the date range is extended beyond the past week.

• Up to date with dev branch
• Branch name follows guidelines
• All PR Status checks are successful
• Peer reviewed and approved

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